Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b95fa4331b23563…

MALICIOUS

PDF

14.9 KB Created: 2019-04-30 04:06:54 +01:00 Authoring application: mPDF 5.7
MD5: fcbef0c145f6acef033d89081d532c1d SHA-1: 9b2392e9902745d22191cd68b6cbc29c663003e1 SHA-256: 1b95fa4331b2356384758fe166d4c90e4674e6d1c191e555572e4708ad39c7af
90 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs pointing to external PDF documents. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious content. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine the exact payload or further intent beyond the link farm.

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/1096093095090097/To-Open-The-Sky-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/6099096092099093/To-Live-Again-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/2097093093096/Chains-of-the-Sea-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/2097094098099/To-Jorslem-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/1096094090092090/The-Man-in-the-Maze-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/1090094097093097095/Es-stirbt-in-mir-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/1092093098094090/Those-Who-Watch-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/6099096092099095/Star-of-Gypsies-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/2097095090091/The-Masks-of-Time-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/2097095090095/Hawksbill-Station-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/2094099096092/The-Secret-Sharer-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/2094095098090/Gilgamesh-in-the-Outback-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/6099096093094090/The-Gate-of-Worlds-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/3092093096094093/The-Time-Hoppers-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/3097097094095090/The-Book-of-Skulls-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/1093090097093092/The-Face-of-the-Waters-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/2095090097096/Tower-of-Glass-by-Robert-Silverberg.pdf

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