Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb2ac85e88539f6…

MALICIOUS

PDF

38.2 KB Authoring application: Mobipocket Creator
MD5: c095d357754987961e0db66b0ea562e6 SHA-1: 0f20b194df0870f2573bafd7f382becb5d4d851f SHA-256: 4bb2ac85e88539f66fbff418450e20c9995c2f7bbf9c1c0bb76a48f8eef2afde
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to external PDF files across various domains, indicative of a link farm or a distribution mechanism for further malicious content. The ClamAV detection as 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier strongly suggest malicious intent. The document body text is heavily obfuscated and does not provide clear user-facing content, but the heuristic firings are sufficient to determine the attack pattern.

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://professionalloss.com/uploads/1/3/0/5/130542692/4319612.pdf
    • http://blockchainbetterbusiness.com/uploads/1/3/0/5/130543483/zakubuvuzomun_lulodenazukujun.pdf
    • http://nancyandersonmarketing.com/uploads/1/3/0/6/130621523/joduk_rewitow_vemumazi.pdf
    • http://rejashorta.com/uploads/1/3/0/7/130739460/gudoxexilefuvib.pdf
    • http://moonrisetours.com/uploads/1/3/0/7/130739427/giruno.pdf
    • http://intracloud.net/uploads/1/3/0/5/130589460/2095045.pdf
    • http://noahsanchorarmy.com/uploads/1/3/0/6/130639608/fevarafixizev-wagusib.pdf
    • http://premijohn.com/uploads/1/3/0/6/130604408/puveritunu.pdf
    • http://lefthandtree.com/uploads/1/3/0/2/130289663/1133d73f0.pdf
    • http://mybulletproofart.com/uploads/1/3/0/7/130739086/9446859.pdf
    • http://chamoisinfo.com/uploads/1/3/0/4/130476266/movudodajixivow_vaxatekovizos.pdf
    • http://uppercapedronemedia.com/uploads/1/3/0/7/130775209/130775209.html#multiplication+math+facts+worksheets+4th+grade

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000308e.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x308E 2652 bytes
font_01_sfnt_off00003c94.bin
f3bb7e2ddacb2a50ff9f05c3b5d3cb5be7046a61f2c4c7d326d9838d12443e55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3C94 8440 bytes

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