Are you using any Amazon services for cloud storage, music, etc?
Have you tried stopping or uninstalling it? If so, does it re-install itself?
Have you cleared your browser history and scanned for malware recently?
I suggest you scan your Mac with this tool: https://www.malwarebytes.com/mac
Also, please see here: https://support.apple.com/en-us/HT202235
I suggest you scan your Mac with this tool: https://www.malwarebytes.com/mac
Also, please see here: https://support.apple.com/en-us/HT202235
Good news. Did you look at how to remove applications? Also, what browser do you generally use? Safari?
Any extensions/add-ons installed with any of your browsers?
Sure. They have an active support forum that is better for Apple products than here (much more PC oriented).
That being said, this is clearly tied to some application or service associated with Amazon and tied to something you installed or accessed. I assume you have an Amazon account. Do you have any Amazon devices?