Seems to be no big deal.
Someone requesting a page that your server doesn't have and sending back a 404.
Do you really need to know more?
It could be anything.
A log spammer? A kiddie? An ill-behaving bot? A ........ (insert other possibilities here)?
Just ignore it.
Or block it, if you find it worth to do so, and if the parameters (like the IP address) remain constant.
And, of course, do not visit the advertized URL.
This is not hacking.