Malicious PDF — malware analysis report

Static analysis result for SHA-256 acffec6a954cab25…

MALICIOUS

PDF

45.8 KB Created: 2020-05-24 22:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36ce6d0cbf6c1ea41da3d07b4bd08b55 SHA-1: bac712699e76e6e8f904ec832b3fa7d5933a9e57 SHA-256: acffec6a954cab25fe31330b7de514385c4d37ab0b011027fb32fe8d4149510e
94 Risk Score

Malware Insights

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

This PDF document contains a large number of external links to other PDF files hosted across various domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting a tactic to manipulate search engine results or distribute content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body is heavily obfuscated, but the primary malicious activity appears to be the distribution of links.

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://waterburytowtruck.com/uploads/1/3/0/6/130604769/130604769.html#gw2+legendary+guide
    • http://beeyie.com/uploads/1/3/0/7/130738912/ganunaxojegofonofal.pdf
    • http://patrickmeursault.com/uploads/1/3/0/6/130639222/fivaretepedaju-luloburexa-dajatixoneximet.pdf
    • http://ncpchoirs.com/uploads/1/3/0/8/130874001/7022525.pdf
    • http://ironcowboys.ca/uploads/1/3/1/4/131452836/mobijigatejofir.pdf
    • http://retrofigureprints.com/uploads/1/3/1/3/131380263/9b094ed192ae771.pdf
    • http://dawnsgenealogyfindingproof.com/uploads/1/3/0/6/130621758/1509080.pdf
    • http://3rdrailmediasolutions.com/uploads/1/3/0/7/130775903/2ccba404e24f3f.pdf
    • http://acesrecords.org/uploads/1/3/0/6/130603779/vaxazuxuzujalipi.pdf
    • http://kirasr.com/uploads/1/3/1/0/131070178/labumikawuboxosowuza.pdf
    • http://usui-toshimasa111.com/uploads/1/3/1/6/131606965/surulewavigelawebiko.pdf
    • http://perception2019.com/uploads/1/3/1/4/131453858/xopexetogotatog_kipor_tabodomuno_lijavo.pdf
    • http://dreamsofdasia.org/uploads/1/3/0/3/130313346/283a8.pdf
    • http://lifestyleasmedicine.com/uploads/1/3/0/7/130739552/6257632.pdf
    • http://honigland.eu/uploads/1/3/0/7/130739318/lenoxomukuku_xagirofosilasi.pdf
    • http://happypawspets.org/uploads/1/3/1/6/131606347/lebuvoxiwig_jonusosug_wuwit_rizawo.pdf
    • http://mta-sts.mail.canicrossnederland.nl/uploads/1/3/0/9/130969143/kerofuk.pdf
    • http://gosmartmark.com/uploads/1/3/0/5/130590164/4760300.pdf
    • http://plasticsintallahassee.com/uploads/1/3/1/6/131606282/4580895.pdf
    • http://epzagroup.com/uploads/1/3/0/4/130475918/70e036c0f.pdf
    • http://westlakeautocare.com/uploads/1/3/1/4/131410736/lidegi.pdf
    • http://dilla.org/uploads/1/3/0/8/130813998/1166195.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_off0000874b.bin
40ac09b2e6ed01615d0991aefdacbcf120e00c1f1dda54962e4d78b81f9d873e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x874B 10564 bytes

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