Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36d93e12f49d05c…

MALICIOUS

PDF

40.1 KB Authoring application: QPDF
MD5: a72a72b1b3d98b083fd8840351e5488d SHA-1: 2f6aa97649acbfaeaabc5e7e7b67b4608aa301a1 SHA-256: f36d93e12f49d05c5d994889a3af1e304fb68d14594b1eced3547f7b5eda34ea
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to other PDF files, a technique often used for SEO manipulation or to distribute malware. ClamAV identified this as 'Pdf.Phishing.TtraffRobotInstall-7605656-0', and a critical heuristic detected a 'PDF_SEO_LINK_FARM'. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves redirecting users to a network of external PDF links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://bandgphotography.net/uploads/1/3/0/4/130476624/jatow.pdf
    • http://doggierapsheet.com/uploads/1/3/0/5/130589166/7676636.pdf
    • http://cclmobile.org/uploads/1/3/0/6/130639071/diviva_zidivijozi_fepidap.pdf
    • http://microphonistbeats.com/uploads/1/3/0/5/130551728/xebapeni-gofuwi.pdf
    • http://oceanassassin.com/uploads/1/3/0/2/130271184/begudumodipiravigun.pdf
    • http://cothamsinthecity.com/uploads/1/3/0/5/130590555/cb7345bacd3.pdf
    • http://eatlocalexpokc.com/uploads/1/3/0/7/130740141/d5ddb77201a12.pdf
    • http://morellicup.com/uploads/1/3/0/7/130775507/610151.pdf
    • http://townhousemarketinggroup.com/uploads/1/3/0/7/130775436/90633a0.pdf
    • http://toniabasihill.com/uploads/1/3/0/5/130543010/ralerudegapi.pdf
    • http://mryu.net/uploads/1/3/0/6/130620268/tuposa.pdf
    • http://cnof.weebly.com/uploads/1/3/0/5/130588720/wuxejoselufiwo_soligukolaxowes_fawazaj.pdf
    • http://tcsonline.net/uploads/1/3/0/8/130814718/130814718.html#unity+2d+game+optimization

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001308.bin
cbe442382c7e18da8d840ca6da5cc3ef992fb86cdfd0f1ad4da82abaf818ea09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1308 7892 bytes

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