Malicious PDF — malware analysis report

Static analysis result for SHA-256 1391a412b9ecc68e…

MALICIOUS

PDF

39.8 KB Authoring application: Poppler-utils
MD5: c5b29d79815933a1151a97713606122c SHA-1: 03c4bf26f36769509f723a03fdeb9bc5977adff1 SHA-256: 1391a412b9ecc68ee26d4b546b7c5cc8a526a70b0bc49af39bf12f919f42bfc9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded URLs pointing to other PDF files hosted on various domains. This pattern is 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 output strongly suggest malicious intent. No scripts were extracted, but the sheer volume of external links suggests a coordinated effort to direct users to potentially harmful resources.

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://nickhaymedia.com/uploads/1/3/0/2/130289658/9764115.pdf
    • http://vinculumartfinance.com/uploads/1/3/0/4/130483303/bijatenutaju-kawuwapomoxi-tusilizux-forifiwi.pdf
    • http://noworknobeer.com/uploads/1/3/0/4/130476427/sukutiwilatalof.pdf
    • http://winestockpa.com/uploads/1/3/0/3/130312968/makizowu.pdf
    • http://playersshack.com/uploads/1/3/0/6/130620501/4035730.pdf
    • http://drjkrohnconsultant.com/uploads/1/3/0/6/130605153/4a85db1afe354b1.pdf
    • http://fixedalready.org/uploads/1/3/0/6/130605078/4958584.pdf
    • http://lisagarcia-rivera.com/uploads/1/3/0/4/130488091/xevaxotulefuma_vugokodijepim_moloxu_zenapod.pdf
    • http://www.guacamolebooking.com/uploads/1/3/0/8/130814479/b05f6.pdf
    • http://slccabroad.com/uploads/1/3/0/5/130588763/5468314.pdf
    • http://ftx7t.slpny.com/uploads/1/3/0/6/130620666/130620666.html#strong+acid+to+weak+base+titration+curve
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002e6a.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2E6A 16036 bytes
font_01_sfnt_off0000459a.bin
48d3b179eb17b0c39b023c8957b69976d17c032c1e3b0a24f184224dc5d1131d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x459A 7840 bytes

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