Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f5404813fdea4d…

MALICIOUS

PDF

36.2 KB Authoring application: Mobipocket Creator
MD5: d984c323084dab9395e69938e289c9e2 SHA-1: d8896b138a68c6f7764831002c71b6b660a5bfda SHA-256: d4f5404813fdea4d0c10c488a112fd5eb3d82e927367f6f6f4dd8896d0b4d2dc
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. The critical PDF_SEO_LINK_FARM heuristic indicates the presence of a large number of external links, with the first being http://wtfishubspot.com/uploads/1/3/0/2/130291908/2edcd31c9.pdf. This suggests the document is part of a link farm designed to manipulate search engine results, likely for phishing or malware distribution. The document body contains garbled text and embedded URLs, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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://wtfishubspot.com/uploads/1/3/0/2/130291908/2edcd31c9.pdf
    • http://rimlkidz.net/uploads/1/3/0/5/130539838/xekisosower-gosapaxabalidaz.pdf
    • http://mindfulmoves.net/uploads/1/3/0/4/130489803/bd975c30.pdf
    • http://www.rachelgiddens.com/uploads/1/3/0/2/130289265/juxixugaz.pdf
    • http://beastfriendz.com/uploads/1/3/0/6/130620710/4799720.pdf
    • http://mindforyouth.org/uploads/1/3/0/6/130640071/3969255.pdf
    • http://millennialbarbers.com/uploads/1/3/0/4/130483649/2367339.pdf
    • http://divinedwelling.org/uploads/1/3/0/3/130379409/nulezafagaf.pdf
    • http://monkeesconcerts.com/uploads/1/3/0/4/130489082/8509600.pdf
    • http://duckcreekgolf.com/uploads/1/3/0/6/130604475/3a2f3.pdf
    • http://zuoxianglin49.com/uploads/1/3/0/5/130589342/4855585.pdf
    • http://velvetarmenia.net/uploads/1/3/0/5/130590653/xuxebenadeba.pdf
    • http://krystalwillis.com/uploads/1/3/0/2/130287920/tusebo_segidomafine_jubiloj.pdf
    • http://pujingttyulecheng.br3h.com/uploads/1/3/0/3/130313177/130313177.html#compensation+for+respiratory+acidosis+formula

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000034b2.bin
e9d40231e77d8ee1ea59c54e4a6a351c033b131a89daa7638e9fd9b3af1160f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x34B2 7984 bytes

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