Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c54ef2c695d95bc…

MALICIOUS

PDF

46.3 KB Authoring application: Pdftk
MD5: 376bec60c03c4d594029c9808e2747b4 SHA-1: bd0ba3132f39e32218a4d6c2433c839f7f7620d9 SHA-256: 4c54ef2c695d95bc3979b19d19f0271342026151c2a26a2434b2fb459e244d58
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links to other PDF documents, a technique often used for SEO poisoning or to distribute malicious content. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier's high confidence score further support a malicious classification. The document body, though heavily obfuscated, contains URLs that are part of this link farm, suggesting the primary purpose is to redirect users to potentially harmful content.

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://zuzubeanpress.com/uploads/1/3/0/2/130271187/gikaniweru.pdf
    • http://mrserio.com/uploads/1/3/0/3/130313504/69e2a.pdf
    • http://farhadebrahimi.info/uploads/1/3/0/3/130313766/rejuluvozekive_diduvavevuf_ruwomijebitu_laginugi.pdf
    • http://al-nusr.net/uploads/1/3/0/7/130775092/wanameli.pdf
    • http://herbalantioxident.com/uploads/1/3/0/6/130620578/junuwono_ruworoxunedoji_dufadomazure_butuxibeg.pdf
    • http://beachclubproductions.net/uploads/1/3/0/4/130483087/tejajifol.pdf
    • http://antonioflowers919.com/uploads/1/3/0/4/130435659/fenipijuzabokajan.pdf
    • http://filipu.srlakhotia.com/uploads/2020/01/29/gisodu.pdf
    • http://rrerealtyservices.com/uploads/1/3/0/7/130739917/9e3be38bd2.pdf
    • http://ps110k.com/uploads/1/3/0/7/130776263/fubolofagab_tojejakir_nibikunevu_bazalitarowa.pdf
    • http://rehphotography.org/uploads/1/3/0/6/130604956/130604956.html#class+12+cbse+chemistry+project+pdf+download

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000012f0.bin
5de01e73374019f71692effc21028e0c345b5715e490d3fef6cf148f5461a1e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0 8752 bytes
font_01_sfnt_off00006e62.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E62 16204 bytes

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