Malicious PDF — malware analysis report

Static analysis result for SHA-256 874ac10dbf565135…

MALICIOUS

PDF

45.4 KB Created: 2020-06-04 00:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14b843ad5a632b83fb66594b97a6799a SHA-1: 3cec1dbf4a5b99873642c8604b7a82ccbedd2182 SHA-256: 874ac10dbf5651351fef8c9970bc4175b6cc8edcf1a0b4c66ecc4d4a759f3129
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which appear to be part of an SEO link farm. The ML classifier strongly indicated maliciousness. The embedded URL and the PDF SEO link farm heuristic suggest the primary goal is to redirect users to potentially harmful content or exploit SEO techniques for malicious purposes. No scripts were extracted, limiting the analysis of direct payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://otf.brdge.org/uploads/1/3/1/3/131381589/131381589.html#skyrim+sex+mod+pc
    • http://cpanel.greatersports.com/uploads/1/3/0/2/130272600/kubuvikagelokeb.pdf
    • http://thecoppertreeco.com/uploads/1/3/2/3/132302926/dovofuvi-wivaladimekuxed.pdf
    • http://artforgoodnesssake.com/uploads/1/3/0/3/130313368/1115135.pdf
    • http://otf.brdge.org/uploads/1/3/1/3/131381589/terms.html
    • http://otf.brdge.org/uploads/1/3/1/3/131381589/dmca.html
    • http://otf.brdge.org/uploads/1/3/1/3/131381589/policy.html
    • https://woginogumeja6990513.files.wordpress.com/2020/06/dukagarugutitozonedusame.pdf
    • https://fozadure.files.wordpress.com/2020/06/73336897481.pdf
    • https://fusanedimi.files.wordpress.com/2020/06/kupanuxalir.pdf
    • https://mesazefa.files.wordpress.com/2020/06/64485144108.pdf
    • https://balujaxovajo.files.wordpress.com/2020/06/92725893809.pdf
    • https://sebakeropi953133814.files.wordpress.com/2020/06/75030279015.pdf
    • https://dojenus.files.wordpress.com/2020/06/24016336160.pdf
    • https://nidiximas.files.wordpress.com/2020/06/83667844910.pdf
    • https://silimidazipa116083215.files.wordpress.com/2020/06/50518887795.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_off00008685.bin
bd03e7036131fcfe2235748ab7151529701b6f4877e56f315b25d66ee6265c7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8685 10368 bytes

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