Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ac1b79f0f6f292…

MALICIOUS

PDF

136.3 KB Created: 2020-05-22 02:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f95d49cb1b87eb9dc5643ec83890758 SHA-1: 443d466ef87daa9c38b26ff4127b68b55ff67123 SHA-256: 41ac1b79f0f6f292f336f1085633f60940f4ab7fef3a5560e8f6f0e263ec12cb
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary purpose appears to be directing users to a network of websites, such as http://miamibeatproductions.com/, which host further PDF documents. This technique is often used for SEO manipulation or to distribute malicious payloads. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://mosthi.org/uploads/1/3/1/4/131408230/131408230.html#luis+alonso+campa+ponce
    • http://miamibeatproductions.com/uploads/1/3/1/3/131383580/gafub.pdf
    • http://dnsruralsprayingcontractor.com/uploads/1/3/0/7/130738597/tipitobugigex.pdf
    • http://benefithealthcarestaffing.com/uploads/1/3/1/1/131163763/9988751.pdf
    • http://pldstationroad.com/uploads/1/3/0/9/130969372/3d172b567b.pdf
    • http://mta-sts.mail.airflowtactics.com/uploads/1/3/0/8/130874284/mevoso.pdf
    • http://wyldpear.photo/uploads/1/3/0/7/130739773/gosel.pdf
    • http://helpourplanetevolve.com/uploads/1/3/0/7/130775214/wamojagibubevisumo.pdf
    • http://kaif.life/uploads/1/3/1/0/131070705/cccf4c4.pdf
    • http://mellysfashions.com/uploads/1/3/0/7/130775680/ribixuvad.pdf
    • http://bellavella.com/uploads/1/3/0/3/130323641/voxajagomata.pdf
    • http://themayagroup.net/uploads/1/3/0/5/130545098/853d6585e6050.pdf
    • http://flightech.es/uploads/1/3/1/8/131856772/5190572.pdf
    • http://xn--80aaa4ai8bf5c3c.xn--p1ai/uploads/1/3/0/2/130288757/getidam.pdf
    • http://legaldocmasters.com/uploads/1/3/0/4/130483384/ee1cefff9d97b.pdf
    • http://itsrileylyn.com/uploads/1/3/1/3/131383743/dademu_mavoxiduxawiv_zidorijiwexo_nudoparaxigowa.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_off0001e8da.bin
02ffd2170c00c0c2e6f60d74e46ccce24c5eab38483308d143a38857308bee45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E8DA 13460 bytes

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