sounds like a snare and a clap layered with a bunch of reverb. Maybe even a closed hi hat on top. As far as the sound, it could just be jazz chords with chorus and reverb on it, maybe even some stretching grain shifting plugin or something to give it some variety during beat drops n shit.
Dude who uploaded that track seems like he pays attention to his listeners, so you could always try getting in touch with him. Chances are he'd be flattered that you're into his production techniques.