Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d2262613356a502…

MALICIOUS

PDF

32.6 KB Created: 2020-05-09 19:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2c0029f39fa03598bce6abe756bf9f84 SHA-1: cb038ad2cfed8c04299bad35d3a3f37d2367cab4 SHA-256: 9d2262613356a5024ab00ad5413f51f92f2a2bd723c349593f62bb1cce233d9a
96 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 are numerically or generically named and hosted on unrelated domains, suggesting a link farm for SEO manipulation or malware distribution. One of the embedded URLs, 'http://bristoncondos.com/uploads/1/3/0/5/130588425/130588425.html#messenger+apk+latest+version+2018+free', directly relates to the document body's attempt to lure users with a fake search result for a messenger APK. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://bristoncondos.com/uploads/1/3/0/5/130588425/130588425.html#messenger+apk+latest+version+2018+free
    • http://fireworkssuperstorewa.com/uploads/1/3/1/6/131636948/7068189.pdf
    • http://dancecentral-stcloud.com/uploads/1/3/0/6/130639397/ligojizate.pdf
    • http://hockeycorner.shop/uploads/1/3/0/5/130550925/8437463.pdf
    • http://economyprintingsupplies.com/uploads/1/3/1/6/131636946/masuvezogudo.pdf
    • http://reggiewatkinspiano.com/uploads/1/3/1/3/131383650/nubanog.pdf
    • http://thenorafarms.com/uploads/1/3/0/6/130603859/desarodeku-xaxug-vizudobebowi-ziraxemipe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off000056a7.bin
dc7894f2ae9cb6351979150ae09014384a3f68334e2a0ffb82d3e869eee74326		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56A7 10056 bytes

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