neosmart[.]net/blog/2017/beware-of-this-new-chrome-font-wasnt-found-hack/
I don't know if this one is widespread, or spreading, or just a one-off -- the blog's author came across it on one WordPress site. It was picked up by Neowin[.]net, but haven't seen mention anywhere else so far. What makes it worth mentioning now IMHO is that it seems like it would have a lot of potential to wreak havoc if it or a variant becomes more wide spread.