Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4cae7773a12a607…

MALICIOUS

PDF

42.6 KB Created: 2020-04-05 05:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 30a48f49166019e31e80eeb5b15f2f4c SHA-1: 810e7641092afc821d0654eb24efe3bd4b3285df SHA-256: e4cae7773a12a60772bc04155930794949baf7c4bdf069458617ecb5bab82e44
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, many of which point to other PDFs hosted on SEO-optimized domains. This indicates a link farm designed to drive traffic or potentially host further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm attack pattern.

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://mapsunearthed.org/uploads/1/3/0/7/130738790/130738790.html#peter+pan+summary+book+report
    • http://tierney.art/uploads/1/3/1/4/131438059/3021754.pdf
    • http://lify.ca/uploads/1/3/0/3/130312934/sixupufik-lajasi-debamenokukek.pdf
    • http://carolinetejero.com/uploads/1/3/0/6/130604552/paburenugutet.pdf
    • http://detransitionstudy.org/uploads/1/3/0/5/130588940/6841050.pdf
    • http://anchor-mi.com/uploads/1/3/0/2/130288751/2eea849.pdf
    • http://ametkorca.com/uploads/1/3/1/0/131070231/nufatamal_jiwuxalebonorul_virigogoke.pdf
    • http://tastyhealthyconvenientchoices.net/uploads/1/3/0/8/130813740/a5ab0d4027a04d.pdf
    • http://simplyoakboutique.org/uploads/1/3/1/3/131384300/077bbf2d.pdf
    • http://ironspearproperties.com/uploads/1/3/0/6/130603724/1513724.pdf
    • http://hondenworkshops.net/uploads/1/3/0/4/130488241/8ce1e16dd3ff47.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_off00007d33.bin
0a60e97c0de4d283f39f29ea4a1b91087296eddc788e7d71912ad59a6b64a401		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D33 7860 bytes

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