Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e2ae9541c63f9d…

MALICIOUS

PDF

42.0 KB Authoring application: Serif PagePlus
MD5: e1af2ce220d150cba2d8943cb6999567 SHA-1: 8625e5d2fc48b8d8857bd247724fd3fd598e1a1d SHA-256: 91e2ae9541c63f9dcf4b16ce50b4faf3d25d0ca988b8319d61e1dcf717800356
152 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, which flagged it as 'Pdf.Phishing.TtraffRobotInstall-7605656-0'. Static analysis revealed a significant number of embedded URLs pointing to external PDF files, characteristic of a link farm designed for SEO manipulation or phishing. The document body, though heavily obfuscated, contains references to bibliography formats and the authoring application 'Serif PagePlus', suggesting a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://cwcphysio.com/uploads/1/3/0/3/130313002/6920491.pdf
    • http://5thwoman.com/uploads/1/3/0/3/130313230/wiseriwi-kisubisu.pdf
    • http://trailerrepairrichmond.com/uploads/1/3/0/4/130483830/2a9066.pdf
    • http://xupifa.amazon-sellers-fba.com/uploads/2020/01/28/094dbab3f993.pdf
    • http://musicforsoho.com/uploads/1/3/0/6/130604141/paxabusasuruxiz_zigulosipawo_xudukivebot.pdf
    • http://nuobeijinghotel-chinese.devsite-1.com/uploads/1/3/0/6/130639222/ruget_xokise.pdf
    • http://queblesolutions.com/uploads/1/3/0/5/130588872/lapopuno.pdf
    • http://tcsonline.net/uploads/1/3/0/5/130588885/130588885.html#sample+bibliography+mla+works+cited+format

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001223.bin
cd5d83fab13de5225b88fe876106cbc4702c238dc130896d396fce2e7787f091		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1223 8920 bytes

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