Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4894ffef539688…

MALICIOUS

PDF

32.6 KB Authoring application: Pdftk
MD5: f82afea50a2c33a40488db4caae040ab SHA-1: 3c8514515e2cffc2daa4a5b72faed78f6bd58596 SHA-256: 9f4894ffef5396882a1a7b12f139bab2488d463197f68e1229dd4cb0d8900f9d
150 Risk Score

Malware Insights

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

The PDF document was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing or traffic-robot-related threat. The primary attack pattern involves a link farm, with numerous embedded URLs pointing to other PDF files. This suggests an attempt to manipulate search engine results or distribute further malicious content through a network of linked documents.

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://myovisioninfo.com/uploads/1/3/0/6/130604027/8b970a25.pdf
    • http://clumsybutcute.com/uploads/1/3/0/7/130739126/lolef.pdf
    • http://tnsafefood.com/uploads/1/3/0/4/130435943/rabubogivo.pdf
    • http://thesperobrand.com/uploads/1/3/0/7/130738506/c4feaf68cffa.pdf
    • http://educationalroboticsreview.com/uploads/1/3/0/6/130639404/d3f6f03c3370.pdf
    • http://nplfiles.com/uploads/1/3/0/2/130272524/c49b6.pdf
    • http://lastsecondcheck.com/uploads/1/3/0/8/130874244/tesukiji_nagugu.pdf
    • http://nataliekfitness.com/uploads/1/3/0/5/130543148/33ce7a5fea473c9.pdf
    • http://chapelhill.plus/uploads/1/3/0/2/130289211/a26b3896c7.pdf
    • http://madeinvenice.net/uploads/1/3/0/7/130739011/8022167.pdf
    • http://earthstarweb.com/uploads/1/3/0/6/130620612/830d25d4e.pdf
    • http://corustest.devsite-1.com/uploads/1/3/0/7/130738730/130738730.html#kaplan+acca+f7+exam+kit

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000028db.bin
6cae9e625e43b283d2e44143d35ce0d7cbc20085e761c6f3b1dc0ba55b0da7c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x28DB 7776 bytes

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