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It's a PDF with the interview. Didn't automatically download for me in Chrome, just loaded on the webpage.

Promise promise this isn't malware, it's just a segment of my ebook so people can see what its like if they want to download the full thing.

You might have browser prefetching enabled. Not sure this is default behaviour.

They included the pdf in an iframe on the page, which most browsers will want to load instantly. If a browser is configured to download PDFs instead of render them inline, this is expected behavior.

Using an iframe is a pretty bad way to offer a PDF to viewers, but the website definitely has quite a few strange mannerisms apart from that.