Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd2c15f02622120…

MALICIOUS

PDF

36.5 KB Created: 2020-06-12 06:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f81b97efbe2bda7b51eff7609409c5fc SHA-1: 10edfb970f9dbbcdad36f9b532d82b88506fac1e SHA-256: ffd2c15f02622120416a8e65284bd00bdf52f78b9a46a5a0af88e0ae6af58475
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to SEO-optimized PDF files on various domains. This behavior is indicative of a link farm or traffic generation scheme, which can be used to distribute malicious content or monetize traffic. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the link farm. No scripts were extracted, limiting the analysis of direct payload delivery.

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://67wq26.bdgct.com/uploads/1/3/0/7/130739892/130739892.html#best+free+jpg+to+pdf+converter+software
    • http://manringmasterpiece.com/uploads/1/3/0/7/130776149/2442161.pdf
    • http://easyspeakhebrew.com/uploads/1/3/0/6/130620430/8959562.pdf
    • http://wendelljtucker.com/uploads/1/3/0/6/130620480/7402330.pdf
    • http://blog.carolinafactoryoutlet.com/uploads/1/3/1/4/131454349/49c251150.pdf
    • http://cdiviaq.com/uploads/1/3/0/8/130814360/rewuwo.pdf
    • http://urgent1.com/uploads/1/3/0/6/130621776/1cb5d29b.pdf
    • http://webdisk.midvest-pools.co.za/uploads/1/3/0/7/130775606/xadibo-zezoxokiwo-wirofeviga.pdf
    • http://mail.allaboutoilstore.com/uploads/1/3/0/6/130640059/bopomi.pdf
    • http://cpanel.lllofts.com/uploads/1/3/0/5/130589036/ketupijafobolug.pdf
    • https://fufegolakod124143400.files.wordpress.com/2020/06/bimavuporan.pdf
    • https://giwogixud.files.wordpress.com/2020/06/ludijazetorum.pdf
    • https://leladeg.files.wordpress.com/2020/06/rirux.pdf
    • https://felurubi.files.wordpress.com/2020/06/dasavib.pdf
    • https://nomebivesaz.files.wordpress.com/2020/06/likofojofidujowux.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_off00006494.bin
8c4b72739b0840b01cfd384910e464f2cdacb761236db0955a1bcc86a64a5f01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6494 9988 bytes

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