Malicious PDF — malware analysis report

Static analysis result for SHA-256 1639a1fcbde08295…

MALICIOUS

PDF

35.8 KB Authoring application: GIMP
MD5: 5b96efe44ec3a54aff300ce84137f6a6 SHA-1: 939b5738394377aaae14732d4b71d9204869b39d SHA-256: 1639a1fcbde0829535d49579018e109b63235e34d8e50ff0ecd5d4fcf99125e2
152 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.TtraffRobotInstall-7605656-0 and a machine learning classifier indicated a high probability of maliciousness. The document body, despite appearing to be about piano sheet music, contains numerous embedded URLs pointing to external PDF files. This suggests a link farm or distribution mechanism, likely intended to manipulate search engine results or serve as a lure for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://q72spiceco.com/uploads/1/3/0/7/130739294/71124a7f.pdf
    • http://tallahasseewmc.com/uploads/1/3/0/6/130621535/tijetuk.pdf
    • http://kegoma.vipiski-besplatno12.icu/uploads/2020/01/28/9824284.pdf
    • http://midlandfencepros.com/uploads/1/3/0/2/130289338/kupipibadukarap.pdf
    • https://rafilaluxonijew.weebly.com/uploads/1/3/0/4/130476150/8252054.pdf
    • http://thebesticecreamandcoffeesolvang.com/uploads/1/3/0/6/130604742/2601635.pdf
    • http://americanational.us/uploads/1/3/0/7/130739120/130739120.html#shallow+piano+sheet+music+accompaniment

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000010b0.bin
9ef10e28502a85b7db970138cf0478bdd28bdd271e054c25359100e37707b5ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0 9288 bytes

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