Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ec597d26075d67…

MALICIOUS

PDF

50.4 KB Created: 2020-04-11 10:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bdab52e6a11dc2eb0124f969321499b6 SHA-1: 930dc3ff4c1985290955ffa0812e8bb179991001 SHA-256: e3ec597d26075d67100bec9c1a426ada8e8c9b0cb13c7b1529110a39f8d2e502
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document exhibits characteristics of a link farm, embedding a large number of external URLs. The primary lure appears to be "machine learning cheat sheets", but the extensive list of links to other PDFs on unrelated domains suggests a malicious intent, likely for SEO manipulation or to serve as a distribution point for further malware. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

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://74-123-72-236.mgwnet.com/uploads/1/3/1/4/131453171/131453171.html#machine+learning+cheat+sheets+kdnuggets
    • http://emilysfriendsrescue.com/uploads/1/3/0/4/130435518/xanajelot.pdf
    • http://ourmotherofsorrows.church/uploads/1/3/0/5/130590596/kujaniwa_vikejupamadajep_zedoveraso_xifemedabif.pdf
    • http://listonamoblamientos.com/uploads/1/3/0/6/130603853/514027.pdf
    • http://eurekareaganfestival.com/uploads/1/3/1/3/131384305/minewijuxivare.pdf
    • http://tikitownhouse.com/uploads/1/3/0/5/130540437/592ca96ee56.pdf
    • http://easycab.se/uploads/1/3/0/6/130604427/17c8ce9b24c27fe.pdf
    • http://afgraphicdesigns.com/uploads/1/3/0/6/130604735/f3a7f636a4bab.pdf
    • http://bdrobohackerz.org/uploads/1/3/0/5/130538863/jizefepoxilazoviku.pdf
    • http://nulifepartners.com/uploads/1/3/1/4/131483148/180044.pdf
    • http://soultalian.com/uploads/1/3/0/3/130323836/zatuvirifesi.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_off00009ace.bin
45d218391ca3ec930cfe61c3f3ac7736e7534c817d67c6ac2b67efba8aba4216		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9ACE 9244 bytes

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