Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8aa7203cc66d37…

MALICIOUS

PDF

55.0 KB Authoring application: OpenOffice Draw
MD5: b94fa327e51567e7fb20846cb740d54f SHA-1: da7cc9c4653159bdceb93a045d8d99ac0d81f9e6 SHA-256: 5a8aa7203cc66d376700f74eb46809bb7bd60e80b725cc0fae64a45478273573
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to distribute malicious content. The presence of a 'visual download button' heuristic further supports the idea that the document is intended to trick users into downloading additional malicious files. ClamAV detection as 'Pdf.Phishing.TtraffRobotInstall-7605656-0' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://brawlinfo.com/uploads/1/3/0/5/130551517/52373b341d3.pdf
    • http://readysetflye.com/uploads/1/3/0/6/130605452/1e8e18.pdf
    • http://turpinenterprises.com/uploads/1/3/0/2/130289561/387272.pdf
    • http://onlinefitnessunderground.com/uploads/1/3/0/6/130639954/465343.pdf
    • http://menonlyadventures.com/uploads/1/3/0/6/130640218/85572ffc.pdf
    • http://thesoftearth.com/uploads/1/3/0/6/130604764/waputezixutated-worixepudeniz-pulixewopel.pdf
    • http://branchlutheranschoolshaiti.net/uploads/1/3/0/7/130739037/foxazulubamuje.pdf
    • http://foothillsbiblefellowship.com/uploads/1/3/0/6/130621488/130621488.html#chest+dips+perfect+form

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000011ed.bin
4d8f70368f5c6c91e41870dc04f9cd74c85b8d2f8d656edf29511697a5d32f6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED 8764 bytes

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