Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc8039836fd601bc…

MALICIOUS

PDF

37.9 KB Created: 2020-06-24 08:39:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9761c9b375266cb1d40d8fcafb69f590 SHA-1: 4bba7f8d59fa8268dc7ce67ed44e6b51a1b59923 SHA-256: cc8039836fd601bcf0251cf1f3d4afe111d539b6d5c8232df565e61ad12aa38d
92 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of external links to other PDF files hosted on various domains, indicative of a link farm or SEO spamming technique. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the sheer volume of external links suggests a malicious intent to redirect users to potentially harmful content or to manipulate search engine rankings.

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://5nv.undesirable.us/uploads/1/3/0/5/130590777/130590777.html#kobo+mini+pdf+reflow
    • http://alexiswalker2000082250.com/uploads/1/3/0/5/130588841/8284963.pdf
    • http://millerforcommissioner.org/uploads/1/3/0/9/130969910/4c60da8fa30.pdf
    • http://oscarvoisin.com/uploads/1/3/1/4/131453199/litotovugi.pdf
    • http://laughingcrowartstudio.com/uploads/1/3/1/8/131856700/1811702.pdf
    • http://wolvesofgrace.com/uploads/1/3/1/6/131637311/4508553.pdf
    • http://friendlyislandsxm.com/uploads/1/3/0/7/130776674/komirerojekipub_karuduni_zelezemoj.pdf
    • http://jamesbdanner.com/uploads/1/3/0/5/130589077/4860782.pdf
    • http://sedanthegodofsound.com/uploads/1/3/0/7/130775513/tasegunege-ruzotisilup-kojotunajilume.pdf
    • http://macrotopia.com/uploads/1/3/1/3/131398182/5429502.pdf
    • http://mdfitnessconsulting.com/uploads/1/3/0/7/130740193/1470970.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005828.bin
c43b1bd76f4f95abf442c0f6694bd6d152d9f521633b28a501f5376b00d4fc1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5828 4708 bytes
font_01_sfnt_off00006808.bin
cd7de39d669c778717d9b7478898abbc76b78f61afca22ad897e3dc068b0f168		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6808 10432 bytes

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