Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc9c826d1557c454…

MALICIOUS

PDF

53.3 KB Authoring application: Pdftk
MD5: 3550fd054506f32480bb629f04784733 SHA-1: 26b7009591172b8225d79282b27e29b9e2262564 SHA-256: cc9c826d1557c45407e731f95794b460df97438393fc3e9a9b70e698946cbc2d
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The ClamAV detection as 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier strongly indicate malicious intent. The embedded URLs point to suspicious PDF files on various domains, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://catholicsonfire.net/uploads/1/3/0/5/130589083/mewujule_luzipelanog_ditopumuva_puxorugape.pdf
    • http://nplfiles.com/uploads/1/3/0/6/130605403/mofub-venozirotez-zuluzupud-wazire.pdf
    • http://doz.wallracercar.info/uploads/2020/01/28/1b308f8bfd762.pdf
    • http://nationalriskmanagementgroup.com/uploads/1/3/0/5/130551746/130551746.html#dieta+amucosa+resumen

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000010bf.bin
b2cbd66cf7230ed9ad44835bceb3df163870743cc97e289afa5047a8f914e8f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF 10180 bytes
font_01_sfnt_off00008bba.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BBA 16036 bytes

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