This is called "SnowBlood". It's a delightful and very bloody animation about an evil snowman chasing and killing a bunch of snowboarders for no reason other than just to do so.
"Why put something so morbid?", You might ask.
Well, while it is almost a 4 minute horror film, it is quite hilarious and the animation is simply fantastic. It is so high quality, including camera moves and character animation, that I am surprised that it is not studio produced. It is made by students who seem like they attend an animation school.