I have recently placed an ad in a weekly publication that sends out a PDF file. My ad is directly linked so that the reader can click on it and go to my website. The PDF file is hosted on a different server, but is, in fact, a PDF file that has to be downloaded and viewed on that site, not emailed or shared that way. I have Google Analytics and a couple other stats tracking programs installed and I can't see the referring URL from this other site at all, in anything. Is there something I can ask the designer of the PDF file to include in her links to make them trackable? Or is this simply not possible?
Can you ask them to put some token in the query string of the URL to the site?
Use Google Analytics Campaign Tagging.
This tool will help set it up. You'll want to classify the variables such that the source and the medium are set, at minimum.
http://www.google.com/support/analytics/bin/answer.py?hl=en&answer=55578
So, for example, if your URL is http://example.com, you could set the parameters as such:
utm_source: BlahNews utm_medium: newsletter utm_campaign: july10issue
Your resulting URL would be http://example.com/?utm_source=BlahNews&utm_medium=newsletter&utm_campaign=july10issue
Google Analytics would track these hits under that Campaign, Source and medium.
If the URL is displayed raw, and want to avoid 'displaying' an ugly URL, you could setup an internal redirect to that URL, and it looks like you're using WordPress, there are a few free plugins that manage redirects like this (I happen to like 'Redirection')
So, you could tell the plugin to redirect
http://example.com/blahnews TO http://example.com/?utm_source=BlahNews&utm_medium=newsletter&utm_campaign=july10issue