Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ce18269fd49a22…

MALICIOUS

PDF

20.7 KB Created: 2020-03-18 22:16:12 +00:00 Authoring application: mPDF 5.7
MD5: 99c921f55f78f75044e7b3c3edece7c0 SHA-1: 46d184febea7925c14715a3e8bdf5fda0e32d2a5 SHA-256: b9ce18269fd49a22ff42c1f91454d819e8eb73e429cb5f5df449d38e28a0c2fc
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 also flagged this PDF as malicious. The primary attack pattern appears to be SEO manipulation or redirection to potentially malicious content hosted at the numerous ujcsiniio.myhome.cx domains. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the exact payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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://ujcsiniio.myhome.cx/4cd9cd6cd9cd7/East-Wind-West-Wind-by-Pearl-S-Buck.pdf
    • http://ujcsiniio.myhome.cx/8cd0cd9cd0cd6cd3/Kinfolk-A-Novel-of-China-Oriental-Novels-of-Pearl-S-Buck-by-Pearl-S-Buck.pdf
    • http://ujcsiniio.myhome.cx/3cd4cd3cd2cd1cd8/West-Wind-s-Fool-and-Other-Stories-of-the-Devil-s-West-by-Laura-Anne-Gilman.pdf
    • http://ujcsiniio.myhome.cx/4cd4cd1cd9cd0/The-Wind-Singer-Wind-on-Fire-1-by-William-Nicholson.pdf
    • http://ujcsiniio.myhome.cx/2cd8cd5cd6cd4cd9/Fire-Wind-The-Wind-Drifters-1-by-Guy-S-Stanton-III.pdf
    • http://ujcsiniio.myhome.cx/1cd8cd2cd6cd7cd2/Ode-to-the-West-Wind-by-Percy-Bysshe-Shelley.pdf
    • http://ujcsiniio.myhome.cx/1cd3cd9cd4cd0/West-Against-The-Wind-by-Liza-Ketchum-Murrow.pdf
    • http://ujcsiniio.myhome.cx/4cd0cd1cd9cd7cd6/West-Against-the-Wind-by-Liza-Ketchum-Murrow.pdf
    • http://ujcsiniio.myhome.cx/1cd6cd4cd9cd7cd4/Zephyr-The-West-Wind-Chaos-Chronicles-1-by-R-J-Tolson.pdf
    • http://ujcsiniio.myhome.cx/3cd1cd9cd9cd5cd3/A-Place-to-Belong-Wild-West-Wind-3-by-Lauraine-Snelling.pdf
    • http://ujcsiniio.myhome.cx/1cd5cd7cd1cd6cd1/West-Wind-Flood-Tide-The-Battle-of-Mobile-Bay-by-Jack-Friend.pdf
    • http://ujcsiniio.myhome.cx/4cd4cd1cd3cd1/The-Mark-of-the-Golden-Dragon-Being-an-Account-of-the-Further-Adventures-of-Jacky-Faber-Jewel-of-the-East-Vexation-of-the-West-and-Pearl-of-the-South-China-Sea-Bloody-Jack-9-by-L-A-Meyer.pdf
    • http://ujcsiniio.myhome.cx/4cd3cd0cd6cd3cd3/Wind-River-Wrangler-Wind-River-Valley-1-by-Lindsay-McKenna.pdf
    • http://ujcsiniio.myhome.cx/5cd1cd7cd9cd8/Wind-Chime-Caf-Wind-Chime-1-by-Sophie-Moss.pdf
    • http://ujcsiniio.myhome.cx/1cd8cd2cd1cd5cd3/Wind-Chime-Summer-Wind-Chime-3-by-Sophie-Moss.pdf
    • http://ujcsiniio.myhome.cx/1cd8cd8cd8cd1cd6/Wind-Chime-Wedding-Wind-Chime-2-by-Sophie-Moss.pdf
    • http://ujcsiniio.myhome.cx/5cd1cd5cd5cd2cd4/Whatever-the-Wind-Delivers-Celebrating-West-Texas-and-the-Near-Southwest-Photographs-of-the-Southwest-Collection-by-Walter-McDonald.pdf
    • http://ujcsiniio.myhome.cx/1cd0cd5cd1cd3cd8cd9/WIND-IN-THE-WILLOWS-BY-KENNETH-GRAHAME-ILLUSTRATIONS-The-Wind-in-the-Willows-is-a-children-s-novel-by-Kenneth-Grahame-first-published-in-1908-Alternately-slow-moving-and-fast-paced-it-focuses-on-by-Kenneth-Grahame.pdf
    • http://ujcsiniio.myhome.cx/3cd4cd0cd2cd4cd8/Mandala-by-Pearl-S-Buck.pdf
    • http://ujcsiniio.myhome.cx/6cd4cd2cd2cd4cd7/Sons-by-Pearl-S-Buck.pdf
    • http://ujcsiniio.myhome.cx/4cd4cd1cd3cd1/The-Mark-of-the-Gol

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