While some early development builds might exist in private hands, no functional "leaked" version of the PS3 game has ever been made public for general download. Best Alternatives for PS3 Owners
Most "MKX PS3" files found online are deceptive. They are often just copies of Mortal Kombat 9 (2011) with modified cover art or misleading filenames. Mortal Kombat X Ps3 Pkg Download
Since you cannot play Mortal Kombat X on the PS3, here are your best options to get your fighting fix: Mortal Kombat X: PS3 & Xbox 360 Versions Cancelled While some early development builds might exist in