Malicious PDF — malware analysis report

Static analysis result for SHA-256 fce4d84b675d8eab…

MALICIOUS

PDF

27.6 KB Created: 2020-04-11 02:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 98ffa3913d988859e5060140352f7bb1 SHA-1: bb317bf23d747ad4292f24b74b359fed1eb5b0ce SHA-256: fce4d84b675d8eab94af6f70222fe5b4f92dd269a299546d672308ad877f5bc6
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files hosted on similar domains. The document body text, though partially corrupted, includes 'Word ladders answer key' and references to the authoring application, suggesting a lure to a seemingly innocuous document. The primary heuristic 'PDF_SEO_LINK_FARM' indicates a technique to generate numerous links, likely for SEO manipulation or to host malicious content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample, limiting the ability to determine specific payload delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://humannaturefoundation.com/uploads/1/3/0/2/130291696/130291696.html#word+ladders+answer+key
    • http://disctest.ca/uploads/1/3/1/3/131384468/916f72.pdf
    • http://thepositivepatientexperience.com/uploads/1/3/0/8/130813403/fegomu_tojozumurezibut_lonixukure.pdf
    • http://sammyzucats.com/uploads/1/3/1/4/131438758/8bcfabc57.pdf
    • http://trend36fashion.com/uploads/1/3/0/6/130639906/226e631df564b.pdf
    • http://systersinchrist.org/uploads/1/3/0/6/130604361/2484883.pdf
    • http://artandsciencemedicalaesthetics.com/uploads/1/3/0/9/130969414/6408039.pdf
    • http://joeziccardi.com/uploads/1/3/1/4/131455337/lijunovotub.pdf
    • http://iamfree2b.net/uploads/1/3/0/2/130288522/kewuwomafeku_wofel_vasenupe.pdf
    • http://proquestce.com/uploads/1/3/1/4/131438171/lunizo.pdf
    • http://rachelwinzar.com/uploads/1/3/1/1/131164171/4796603.pdf
    • http://griffinpacific.com/uploads/1/3/0/3/130313388/1271017.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_off0000494f.bin
b9a2f03e84b3915253892531d84399b5bdd23e9cb71e9de76b74bb805d33c7f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x494F 6264 bytes

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