Malicious PDF — malware analysis report

Static analysis result for SHA-256 3575bc5737b69c37…

MALICIOUS

PDF

40.1 KB Created: 2020-04-02 16:39:43 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d6b019b40adedcc093c79eb5de29ec79 SHA-1: e0c8008cd45e92ae9c310d080f1fce4773ffa333 SHA-256: 3575bc5737b69c375ed3fe7b86e81c368238de7024466cbbf4bcc6867c065870
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to various domains, characteristic of a link farm or SEO spam campaign. The ML classifier strongly indicated maliciousness. The primary attack pattern involves directing users to a network of seemingly unrelated PDF documents hosted on different domains, likely for traffic generation or to host further malicious content.

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://kjosbeautifulmess.com/uploads/1/3/0/3/130379504/130379504.html#variable+ind%C3%A9pendante+psychologie
    • http://capturethedreammi.net/uploads/1/3/0/7/130739143/wunamujenovunetinos.pdf
    • http://cocodixon007.com/uploads/1/3/1/4/131411078/5249543.pdf
    • http://vikingtours.dk/uploads/1/3/0/4/130483338/radubunatamajes_pedabovak_newib.pdf
    • http://mswinberg.com/uploads/1/3/0/6/130604639/tazuwezejo.pdf
    • http://bigheart.dk/uploads/1/3/0/4/130476944/7554868.pdf
    • http://kaitumokykla.lt/uploads/1/3/0/5/130538981/vixajekekawuka-fefikopopaxezon-wotosogogapore.pdf
    • http://dtaylor88.com/uploads/1/3/1/1/131163666/nujalesulixulo.pdf
    • http://doesitcountasananime.com/uploads/1/3/0/6/130621004/6097916.pdf
    • http://mysmartlifestyle.ca/uploads/1/3/0/7/130739646/jiraduluz.pdf
    • http://sneakapeak.org/uploads/1/3/0/8/130814066/09be8c.pdf
    • http://mrvictorblack.com/uploads/1/3/0/7/130738831/96043359.pdf
    • http://optiondavail.com/uploads/1/3/0/2/130272364/3049746.pdf
    • http://prakrutigroups.com/uploads/1/3/0/9/130969682/7870264.pdf
    • http://usermarketing101.com/uploads/1/3/0/4/130476447/5806751.pdf
    • http://fatgirlboutique.com/uploads/1/3/0/8/130813669/zadag.pdf
    • http://humblebundleofjoy.com/uploads/1/3/1/1/131164185/sajejiwed.pdf
    • http://youbizclubexpert.com/uploads/1/3/1/3/131384643/5531361.pdf
    • http://rupertslandcb.com/uploads/1/3/0/6/130621815/repelababap_xujive_guwanabelo_wuzexoweli.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_off00006f30.bin
a1c51407670a1bd1d9813e316406416495899e5ad6e027ea30c153c4de5e0d30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F30 9552 bytes

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