Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1fe119542034c17…

MALICIOUS

PDF

33.6 KB Created: 2020-04-10 00:39:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b480da5a54a260772f7be6930c9051de SHA-1: 87b405a130ddeed308c0bd9f0f9d2bab44817fc5 SHA-256: c1fe119542034c172335691f15f80cc4d33a40ac470c8e22f84d916237da686b
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which point to other PDF files on various domains. This behavior is indicative of a link farm or SEO manipulation tactic, designed to drive traffic to potentially malicious sites. The document body, though partially corrupted, contains text related to sentence identification worksheets, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link distribution attack pattern.

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://ss-developments.com/uploads/1/3/1/3/131380600/131380600.html#identify+simple+compound+complex+sentences+worksheets
    • http://premierpointconsulting.com/uploads/1/3/0/7/130776106/lawutegaku.pdf
    • http://sivam.net/uploads/1/3/0/4/130489029/xofufukofofokiw-subob-wanonutizokose.pdf
    • http://lovelyjubblykids.com/uploads/1/3/0/7/130775308/6368158.pdf
    • http://enteroconsulting.com/uploads/1/3/1/3/131380337/zirateponabigo_voruxagirukarem_lubenatopixiriw_paxodolufu.pdf
    • http://hillbillyrottweilers.com/uploads/1/3/0/6/130620885/fufizo.pdf
    • http://metaconsultoriacondominial.com/uploads/1/3/0/2/130274330/983b9caa1fd.pdf
    • http://mycalirado.com/uploads/1/3/0/8/130814283/5090392.pdf
    • http://molokaishores.info/uploads/1/3/0/7/130739416/5505224.pdf
    • http://francontabil.com/uploads/1/3/0/7/130775712/fediji-sebusuxujidof.pdf
    • http://ritabisson.net/uploads/1/3/0/7/130776724/ae273d6cea.pdf
    • http://mylearningsmiles.com/uploads/1/3/1/4/131407493/1178928.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_off00005ac4.bin
83fd8fbdea8ed44401fc6cae298019dd091aa067d69a55c6200ab7ae2ec37460		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC4 7744 bytes

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