Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16a20917b7ec17a…

MALICIOUS

PDF

37.7 KB Created: 2020-04-13 02:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 34f342fbad4b47d0c265361e850adab2 SHA-1: 24cf1f62927d2a24963154a4a2df95c0f90ec313 SHA-256: b16a20917b7ec17af09028cbccccd17b741ac277b0eee09786d5c2854be0947d
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to SEO-optimized domains, a technique often used to distribute malware or phishing content. The ML classifier strongly indicated maliciousness. The document body is heavily obfuscated and contains what appears to be garbled text, but the presence of multiple URLs and the PDF_SEO_LINK_FARM heuristic confirm the intent to redirect users to a network of potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://fa-awareness.com/uploads/1/3/1/4/131453215/131453215.html#ejemplos+de+m%C3%AD+con+tilde+y+mi+sin+tilde
    • http://magubymaguquintana.com/uploads/1/3/1/3/131383646/tibopuviw.pdf
    • http://dancinglightyogaretreats.com/uploads/1/3/1/1/131163634/76075cbc585258.pdf
    • http://mastervideo.tv/uploads/1/3/0/5/130546742/wajowibo-ledutu-wumukotubekab-pikid.pdf
    • http://modernjeetkunedo.com/uploads/1/3/1/4/131483044/2409af4.pdf
    • http://sweetsalty.org/uploads/1/3/0/5/130590503/8714671.pdf
    • http://willandmk.com/uploads/1/3/0/4/130483062/98d8554696b82.pdf
    • http://casinotalent.net/uploads/1/3/1/3/131382141/4206539.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_off00006bbd.bin
722799b14e5b784620cc38048a063dceab8675a565b2968e90f6fdfefd3991bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BBD 8356 bytes

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