Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca949bee73415b04…

MALICIOUS

PDF

31.6 KB Created: 2020-04-13 12:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9039e52b44c56ea27d88f52910420b47 SHA-1: 09a5278e3dd6b5579a16158379a9365193b7af9f SHA-256: ca949bee73415b04451bcf7fcda72582b021a34eed88901242ea47fa2946862c
62 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common technique for SEO spam or directing users to malicious sites. The document body, though partially corrupted, suggests an educational theme ('Ejercicios de multiplicacion algebraica de monomios') which is likely a lure. The heuristic 'PDF_SEO_LINK_FARM' strongly indicates a link farm strategy, aiming to manipulate search engine rankings or distribute traffic to potentially harmful content. No scripts were extracted, but the numerous embedded URLs are the primary indicators of malicious intent.

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://referral360network.com/uploads/1/3/1/3/131398493/131398493.html#ejercicios+de+multiplicacion+algebraica+de+monomios
    • http://whatmotivatesu.com/uploads/1/3/0/4/130489649/76b69.pdf
    • http://stanfordstudentactivities.com/uploads/1/3/0/4/130488530/543f480.pdf
    • http://perfectfood.org/uploads/1/3/0/6/130639810/488ce357.pdf
    • http://michelledgregory.com/uploads/1/3/0/8/130813973/9701276.pdf
    • http://alliancenavigators.org/uploads/1/3/0/5/130539373/56de4729f5.pdf
    • http://weddingsinseychelles.com/uploads/1/3/0/5/130590351/solirolazife-dilemibuweno-sewizomeno.pdf
    • http://crystalenergyarts.com/uploads/1/3/1/3/131384663/vonifufemuwixi.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_off000054ab.bin
cf061513fae2f9537633e31e40472bd95e3abed82c2319aa699a91dc93cf68f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54AB 7520 bytes

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