Searching for "pwnhack.com" in relation to FarmVille 2 it is likely associated with the widespread "resource generator" scams that target popular mobile and social games

Unlike old offline games where currency was stored in a local file on your computer (which could be edited with a text editor or hex editor), Farmville 2 stores your coin and key balance on a remote server. When you plant a crop, the server checks your balance and subtracts the cost.