Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0509aeacc28985d…

MALICIOUS

PDF

47.1 KB Authoring application: Nitro PDF
MD5: 22be39ccb94de6b69af4a7d0b0cee4e1 SHA-1: 9facc80f08fd50073b46dbad4e1d9fc61d2ca067 SHA-256: d0509aeacc28985d7097a7c2e0ce92a4fd3d91f16de651e791938415878be731
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external PDF files, a technique commonly used for SEO poisoning and phishing. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier output strongly indicate malicious intent. The embedded URLs are the primary indicators of compromise, likely serving as lures for further malicious content.

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://watlingst.com/uploads/1/3/0/5/130590026/putixax.pdf
    • http://2words2life.com/uploads/1/3/0/3/130324340/3316ef61d3.pdf
    • http://bayoflights.com/uploads/1/3/0/5/130544823/xasadew-dekaxif.pdf
    • http://rebelbit.com/uploads/1/3/0/4/130490245/6118664.pdf
    • http://lazera.com/uploads/1/3/0/7/130740141/c8365d1f62c251.pdf
    • http://carpetcleancary.com/uploads/1/3/0/5/130539002/130539002.html#transistor+bjt+and+fet+working+in+hindi

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000011cb.bin
538412d0328711db6c4ae81d5fe4023fe5383cf301d7d9744a97e4f34fdb7b6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB 7924 bytes
font_01_sfnt_off0000656a.bin
bd5d0c4f9eae16eed188dbfa39d39ffd1d61b83c2ac3fa6367e66d87282002dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x656A 12772 bytes

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