Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a5c8b74d1408cd…

MALICIOUS

PDF

15.0 KB Created: 2019-05-02 01:46:42 +01:00 Authoring application: mPDF 5.7
MD5: f7e06fe6fd80690a4d263e9ed1bfac92 SHA-1: f493a7ad511d03ae680e7e94901595d76bb45d71 SHA-256: c5a5c8b74d1408cd59e89f60d397080a6e5cd9b4d97cc45d8c45c0f615a106a9
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified as a PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs, though marked as confirmed_benign in isolation, are used in a mass-linking scheme to direct users to potentially malicious content. No scripts were extracted from this sample.

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/4092099095096098/The-Collected-Stories-of-Robert-Silverberg-Volume-6-Multiples-1983-87-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/2097093093096/Chains-of-the-Sea-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/3099098098098097/Nightwings-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/2097094098099/To-Jorslem-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/1090094097093097095/Es-stirbt-in-mir-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/2097090097092098/Nightwings-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/1096094090092090/The-Man-in-the-Maze-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/1093090097093092/The-Face-of-the-Waters-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/1096090093098094/At-Winter-s-End-New-Springtime-1-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/6099096093094090/The-Gate-of-Worlds-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/6099096092099095/Star-of-Gypsies-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/2094099096092/The-Secret-Sharer-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/1096092092093098/Downward-to-the-Earth-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/4098094099099091/Hawksbill-Station-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/2097095090091/The-Masks-of-Time-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/2097093092093/Sailing-to-Byzantium-by-Robert-Silverberg.pdf
    • http://loaminoo.linkpc.net/3099098098098097/Nightwings-by-Robert-Silverb

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