Taking all of this at face value, what's their game here?
* Collect data on IP addresses as silly as me to click through links?
* Hope someone tries to access their SSH?
* Wait for someone to load an image in their email that has some 0-day?
More interesting hints might be in the accompanying text. What kind of content was used to lure you into amazon.co.jp? What was the sent-from / reply-to info?
My impression is that spam is usually unsophisticated and amateur. They intentionally raise transaction costs by looking inauthentic, to weed out wary victims because those will just be a pain when they finally need to trick them into believing they should pay $10,000 to receive a million.
Never attribute to malice that which is adequately explained by stupidity.