Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ff8ebb6b7ac78c…

MALICIOUS

PDF

36.7 KB Created: 2020-04-15 05:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0456d1c3fbfd493a3af387dc69b671bb SHA-1: 2aaec285e0ca2251e8a16947978a0e4030cc4a42 SHA-256: f1ff8ebb6b7ac78c949c6582a49a7989ba080d88e4281c05f2ef2ab5be2376c9
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a significant number of external links, many of which point to PDF files with numeric slugs, indicating a link farm or SEO spam tactic. The document body, though heavily obfuscated, contains a URL that appears to be a lure for 'the best jail games for android'. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the extensive link farm and the nature of the embedded URL suggest a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://brightstepsbehavior.org/uploads/1/3/1/6/131637372/131637372.html#los+mejores+juegos+de+carcel+para+android
    • http://alrightshoppers.com/uploads/1/3/0/7/130775527/wabeweragomidu_bozobilo_vavominuputazar.pdf
    • http://dadevilleband.com/uploads/1/3/0/7/130739472/luxapa.pdf
    • http://lonestareducation.net/uploads/1/3/0/6/130620326/5416222.pdf
    • http://bendigotree.com/uploads/1/3/0/6/130604527/c9026399a.pdf
    • http://niralidevgan.com/uploads/1/3/0/5/130589270/8053476.pdf
    • http://sixcreekscoaching.com/uploads/1/3/0/7/130739802/gojazexapomamupi.pdf
    • http://www.thealiceprince.com/uploads/1/3/0/4/130436313/5fd5878a5de436.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006681.bin
7b69b02d7a02489e2b23e7df7c90f039dda210edfc318e855ef1556b32946d41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6681 8852 bytes

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