Malicious PDF — malware analysis report

Static analysis result for SHA-256 a634f3ad9d9dba5f…

MALICIOUS

PDF

13.9 KB Created: 2019-04-30 18:50:26 +01:00 Authoring application: mPDF 5.7
MD5: ef38234c198c7ec87f967a81603c293b SHA-1: e8e67d009813582e0a058febc10637c2ef8ee4e4 SHA-256: a634f3ad9d9dba5ffbcecb3c675b199e717f118be25b160b658774e7a05a4d4f
90 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various book titles hosted on the `xiixmcuin.linkpc.net` domain. While the URLs themselves are currently marked as benign, the sheer volume and the ML classifier's high confidence score suggest a malicious intent, likely to direct users to potentially harmful content or exploit kits. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9102

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://xiixmcuin.linkpc.net/4203201205207/The-Marx-Engels-Reader-by-Karl-Marx.pdf
    • http://xiixmcuin.linkpc.net/8202205202206205/Karl-Marx-id-es-re-ues-sur-Karl-Marx-by-Yvon-Quiniou.pdf
    • http://xiixmcuin.linkpc.net/5206208208204207/The-Portable-Karl-Marx-by-Karl-Marx.pdf
    • http://xiixmcuin.linkpc.net/9200205206209206/Marx-amp-Engels-A-Biographical-Introduction-by-Ernesto-Che-Guevara.pdf
    • http://xiixmcuin.linkpc.net/4202206205207200/Marx-s-General-The-Revolutionary-Life-of-Friedrich-Engels-by-Tristram-Hunt.pdf
    • http://xiixmcuin.linkpc.net/9207209208201209/Stadtische-Wohnhausanlage-in-Wien-Zwischenkriegszeit-Karl-Marx-Hof-Sandleitenhof-Strindberghof-Karl-Seitz-Hof-Karl-Hoger-Hof-Klose-Hof-by-Source-Wikipedia.pdf
    • http://xiixmcuin.linkpc.net/8203207203203208/The-Communist-Manifesto-by-Karl-Marx.pdf
    • http://xiixmcuin.linkpc.net/5206208208208200/Karl-Marx-by-Allen-W-Wood.pdf
    • http://xiixmcuin.linkpc.net/3209204204204206/On-the-Population-Bomb-by-Karl-Marx.pdf
    • http://xiixmcuin.linkpc.net/5203204209200204/The-Communist-Manifesto-by-Karl-Marx.pdf
    • http://xiixmcuin.linkpc.net/5206208209200203/On-the-Jewish-Question-by-Karl-Marx.pdf
    • http://xiixmcuin.linkpc.net/3207204208207205/The-Communist-Manifesto-by-Karl-Marx.pdf
    • http://xiixmcuin.linkpc.net/3203203200204/The-Communist-Manifesto-by-Karl-Marx.pdf
    • http://xiixmcuin.linkpc.net/7202207204209204/The-Communist-Manifesto-by-Karl-Marx.pdf
    • http://xiixmcuin.linkpc.net/7202208209201203/The-Communist-Manifesto-by-Karl-Marx.pdf
    • http://xiixmcuin.linkpc.net/5208209202204200/The-Communist-Manifesto-by-Karl-Marx.pdf
    • http://xiixmcuin.linkpc.net/6200201204208201/The-Communist-Manifesto-by-Karl-Marx.pdf
    • http://xiixmcuin.linkpc.net/3209205208202206/The-Poverty-of-Philosophy-by-Karl-Marx.pdf
    • http://xiixmcuin.linkpc.net/5209206201202204/Capital-in-Manga-by-Karl-Marx.pdf
    • http://xiixmcuin.linkpc.net/4200209203201207/The-Communist-Manifesto-by-Karl-Marx.pdf

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