Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52ac1967b1e2dd1…

MALICIOUS

PDF

14.9 KB Created: 2019-04-30 04:40:52 +01:00 Authoring application: mPDF 5.7
MD5: c76582801b65499a06b2878bc9a8b3a8 SHA-1: 48f2e1a7734cd0e1b371cf91d41d59ed60f3a467 SHA-256: f52ac1967b1e2dd1ac3bed09c70f70015ce01d5036de22942fe746f82a4c1655
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded URLs, identified as a link farm. The ML classifier strongly suggests maliciousness. While no scripts were extracted, the primary attack pattern involves directing users to a multitude of external PDF files hosted on loaminoo.linkpc.net, likely for SEO poisoning or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9891

Heuristics 2

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://loaminoo.linkpc.net/4092099095097094/The-Collected-Stories-of-Robert-Silverberg-Volume-1-Pluto-in-the-Morning-Light-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/4092099095096095/The-Collected-Stories-Of-Robert-Silverberg-Volume-Five-The-Palace-At-Midnight-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/4092099095096098/The-Collected-Stories-of-Robert-Silverberg-Volume-6-Multiples-1983-87-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/1090093097092093091/Broken-Skulls-MC-Book-1-by-Jenny-Jax.pdf
    • http://loaminoo.linkpc.net/2097090097092098/Nightwings-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/2097094098099/To-Jorslem-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/6099096092099093/To-Live-Again-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/1092093098094090/Those-Who-Watch-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/3099098098098097/Nightwings-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/2097093093096/Chains-of-the-Sea-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/1096094090092090/The-Man-in-the-Maze-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/1096093095090097/To-Open-The-Sky-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/1090094097093097095/Es-stirbt-in-mir-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/2095090097096/Tower-of-Glass-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/6095090099090091/Invaders-from-Earth-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/2097095090095/Hawksbill-Station-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/3092093096094093/The-Time-Hoppers-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/3098096090094095/Tower-Of-Glass-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/2097093092093/Sailing-to-Byzantium-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/4098094099099091/Hawksbill-Station-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/2

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