Mafia 47. Battle of Movie Heroes

and since Zubr has a good reputation, it logically points to Lex or Pila. There's evidence against them, and we can try to connect them. I remember someone mentioning the "payback" clue, which was linked to Pila, and tried to connect it to the "4" in Zubr's signature.
His avatar seems to be from Max Payne. You can investigate that further.