Trace adf.ly source

Hello,
i have a rather strange question.

On one of my websites, for the past few days, i had a really visits boom, and it all came from one link (adf.ly/xxx) xxx is the shortcode irrelevant for the story.

Anyhow, both Statcounter and Analytics show me that the source is that adf link, but i’m curious to know - is there any way to know where that shortlink has been posted?

You can do a link:ad.fly/xxx search on search engines and possibly find some of the sources.

Tried that with no luck.

It’s completely weird. Almost 6k people came from that link and i can’t find it anywhere.