I'm sorry to burst your bubble, but virustotal.com fills this niche. Not only is it incredibly popular, many of my friends in the cyber security field use it regularly. It is ubiquitous there.
Virustotal is the gold standard (and a part of google now) - this still looks like a fun project to have put together as a POC, though I doubt it can be monetized in it's current state.
Great idea though!