"d1r27qvpjiaqj3.cloudfront.net" is the domain where the JavaScript code of the pixel comes from if Tag Integration is used.

You can see the contents of the JavaScript file if you open the Developer Tools of the browser, go to "Network" and click on the file that comes from domain "d1r27qvpjiaqj3.cloudfront.net".

Please note that you only receive data from this domain. No data is sent to it.

See also: Implementation 2 – Data Collection.