Hello Sonu,
Given your age I would assume that you have not been married for very long, but you mention nothing about your family, your wife's family and exactly what your "travel history" is.
Since you're young yet, probably recently married and have no children then the government certainly going to see those as being very tied to your family. An older, married person with children would probably be seen as being more independent and less tied to their parents. I think here too, the government is going to look at your family ties in a negative way, rather thinking that if you were to be given Permanent Resident Status that very soon you would be applying to bring either your family, or your young wife's family over to Canada too. Right now the government is in the process of making that much more difficult.
Not knowing anything about your travel history it is impossible to comment on that, but if you've travelled to Afghanistan India, Iran, Iraq, Jordan or Siria lately that might in itself be the problem. While I don't really like to say it the Canadian government is under lots of pressure from the USA government to make it more difficult for individuals either from those countries or show a history of visits to them to come into Canada, which would give them easier access into the USA. Considering that Canada is a much smaller nation in population and has strong economic and family ties to the USA the Canadian government is going along with that request.
Also your bank account is something that is not favorable to you either. If you had a much greater balance and could show historically that it was that high for a prolonged period the government would veiw that in a much more positive light. The reason being that with a low bank balance the government is concerned that should you be given Permanent Resident Status and not be able to find work immediately, your funds will run out and you would need public assistance. A much larger balance would sustain you and your wife for a longer period during which you would be more likely to find employment.
It's unlikely that you would be granted a visa so soon after being rejected for the reasons you were given. I would suggest that you wait a considerable length of time for some major life change, such as the birth of a child, the marriage to have a longer duration, etc., and refrain from travel outside Pakistan especially to the Middle East. Then you might have more success with a visa application.
I'm sorry to say that under the circumstances you mention there really isn't much hope in getting any kind of favorable decision from Canada regarding immigration for some time yet.
Cheers, 
William James Woodward Brazil Animator, Expat-blog Team