The map itself isn't stolen as far I know but the tileset isn't made by him so he must add credits.
Proof: de_dust2_xmas (2) or probably this ctf_xmas (39)
In other words, if he don't want to add the credits because this tileset isn't made by him otherwise this file will likely to be removed. He use this tileset from the original map that I posted in my comment. Though the possibility is the second file.
P.S: You didn't even included the tileset in your file. Add it and add also the credits in your description otherwise I'll have to remove this file.
@ Talented Doge: Well, I need some kind of proof to instantly remove it. Otherwise you could wait a few weeks as I'm sure nobody will like/download this.
Why did you post the screenshot of the minimap instead of the mapexport and few screenshots of the map? Nevermind, this map looks a poor modified dust 2 in a shitty way. If you don't have an idea how to make an mapexport read the Rainoth's guide ( [GUIDE] How to create a map export in CS2D?).
P.S: Even though if this file is shitty and it will be deleted from F.A., this guide is useful in the future.