Malicious PDF — malware analysis report

Static analysis result for SHA-256 b039c10d200416ea…

MALICIOUS

PDF

32.4 KB Created: 2020-05-15 10:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca3684e649c21e61d045e16b6713d487 SHA-1: 80168ef389fa604999d685b354758bc6362ab33d SHA-256: b039c10d200416ea5dbba2512c7355a3bcafb11d3328d1cba90c65ca5b70b2b2
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to a network of SEO-optimized PDF documents, likely to generate traffic or serve as a landing page for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nursingarmpillow.com/uploads/1/3/0/6/130605078/130605078.html#dynamite+fishing+world+games+achievement+guide
    • http://uniquehealingsolutions.com/uploads/1/3/0/7/130775107/dopofarulaxibe.pdf
    • http://idreamdestinations.com/uploads/1/3/0/5/130539255/taxutu.pdf
    • http://fitbabyboom.com/uploads/1/3/0/6/130620280/zojibivorolu_lovesolu_tobekijojit_baguzebax.pdf
    • http://ericaleaglenn.com/uploads/1/3/1/3/131380641/14f97fdd62c9.pdf
    • http://centralamericaspecialties.com/uploads/1/3/0/6/130604317/44a6b129907.pdf
    • http://angelaaddae.com/uploads/1/3/1/4/131407760/2a5ec83a.pdf
    • http://woodhouseandassociates.com/uploads/1/3/0/7/130740242/zolovuxobirazore.pdf
    • http://bengalimatrimonial.net/uploads/1/3/1/6/131606228/gezilegejoxe-nomuxebovis.pdf
    • http://thebeautifultrail.com/uploads/1/3/0/4/130476628/9564936.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_off0000530f.bin
df0616cccd404c13bae3f70908433b22e9e6184332d41e54233a8ed1835fe465		 pdf-font-stream PDF embedded font (sfnt) at offset 0x530F 10472 bytes

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