immigration security interview in GRU airport

Hi,  I am coming brazil tomorrow. the date is 25/11/16. brazil embassy issued me viper permanent visa on family reunion base because I am married with brasilian.I am pakistani citizen. I will travel with qatar  airways. qater airways issued me (ok to board) report. there mention there on this report.
please be advised.
1- customer is still subject to security interview with local immigration, which may result in boarding denial or entry refusal.
2- all cost related to security escort. meals. return tickets and immigration fine will be allocated as per athority in Qhome in case of Inad.

please tell me. which questions can be ask.

my flight will arrive in Gru sao paulo airport at 18:00 and my next domestic flight ( Gru to maraba city ) time is 21:20

Is this enough time??
It is because. immigration security interview.

Please Help me imidiately

Best Regards,
Mr.  Mukhtar Pakistan

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