Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d9c0a2a59d70114…

MALICIOUS

PDF

32.7 KB Created: 2020-06-09 01:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fd833df2e02c2c2338e1c57e1b163b2 SHA-1: 5657ca91ea7a2ebc3ad69dad3aa69ee6dcb5fee7 SHA-256: 2d9c0a2a59d70114818a02a41566ed4bd8ad97d668d9d60effc9db59fd919cff
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 to other PDF files hosted on various domains, indicative of a link farm or SEO spam campaign. The ML classifier strongly flagged this PDF as malicious. The document body text appears to be corrupted or encoded, but the presence of numerous external links is the primary indicator of malicious intent.

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://loversandmadmen.com/uploads/1/3/0/7/130775808/130775808.html#beynine+bir+kez+hava+de%25C4%259Fmeye+g%25C3%25B6rs%25C3%25BCn
    • http://193.undesirable.us/uploads/1/3/1/3/131383624/8921722.pdf
    • http://matsoniancreative.com/uploads/1/3/1/8/131856225/03466.pdf
    • http://mta-sts.aidamp.com/uploads/1/3/0/7/130776749/13d1fd9213262.pdf
    • http://spokanejunkremovalpros.com/uploads/1/3/1/4/131437969/1637464.pdf
    • http://fishers-point.com/uploads/1/3/0/7/130740530/lozaxupesej.pdf
    • http://mta-sts.mail.leokahlwatercolors.com/uploads/1/3/0/7/130776152/pogilixojem.pdf
    • http://ceo.noc1.net/uploads/1/3/0/5/130588948/5929052.pdf
    • http://prolabsahel.org/uploads/1/3/0/6/130621441/3170484.pdf
    • https://waxukuvovatu.files.wordpress.com/2020/06/rigeletopebab.pdf
    • https://diwonejivu.files.wordpress.com/2020/06/79527945852.pdf
    • https://lufolifijon.files.wordpress.com/2020/06/gutuf.pdf
    • https://tuvivamitoti.files.wordpress.com/2020/06/purojuz.pdf
    • https://fakokuragi.files.wordpress.com/2020/06/nexexarijeziziv.pdf
    • https://lukipidize.files.wordpress.com/2020/06/96647496512.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_off0000548a.bin
2274591672f8c3ed4c882f4c319fd1407149bd0c936779a0e5d09df95caba0fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x548A 10212 bytes

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