Morocco's goals were scored by Bilal Bakkali, Soufiane El Masrar and Idriss Rais El Fenni, while the only achievement of the Brazilians was the work of Carlos Gularte.
A second match between the two teams will be held on Wednesday at 17:00, at the Al Hizam hall.
The two teams had met in the quarterfinals of the Futsal World Cup held last September in Lithuania, where the Moroccan national team had lost to its Brazilian counterpart with the score of 1 goal to 0.