Finding specific image code?

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Hi! I'm trying to find a specific image code that is present on all the pages on my website - it's causing an ADA issue as it has no alt text. It looks like it's in the footer, however this code is not in footer.liquid (or header.liquid). The image is not actually visible on any page of the site, and if google ads were installed, it was long ago by a previous owner. 

My website:

Here is the code I'm searching for: 

<img height="1" width="1" src="//;format=3&amp;la..." style="height: 1px; width: 1px; position: absolute; top: -1000px; left: -1000px;">

Thanks in advance for any help!