Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f1cfbc6570b7d6…

MALICIOUS

PDF

45.4 KB Created: 2020-04-08 05:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 222ec3c9c8f3632fdb573734c31ada3a SHA-1: 3eaeeeabe15c5e87c599359f7d4fcaa7504f470e SHA-256: a9f1cfbc6570b7d61dd62e088400570fa1e57dfc58879bf6335d81c862606aec
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier with high confidence. It contains a large number of external links, characteristic of a link farm or SEO spam campaign, directing users to various domains. The document body, though heavily obfuscated, contains a reference to "Ted talks marshmallow challenge" and the wkhtmltopdf application, suggesting a lure to attract clicks to the embedded malicious URLs.

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://greenmountaincoffe.org/uploads/1/3/1/4/131482958/131482958.html#ted+talks+marshmallow+challenge
    • http://shineonma.com/uploads/1/3/0/7/130776516/3286960e.pdf
    • http://craftycardsbyjj.com/uploads/1/3/1/4/131453733/xularenubadep.pdf
    • http://farmdalehawks.org/uploads/1/3/0/5/130590467/272c998a.pdf
    • http://coiffeurdavid.com/uploads/1/3/0/3/130312929/zorudisalome_tavosoge_xetunedizu_febanusugotarop.pdf
    • http://zauchner.com/uploads/1/3/0/7/130739326/redibafetumofapa.pdf
    • http://perfectbeardz.com/uploads/1/3/0/6/130639910/vogepo_renufos_kobexilo.pdf
    • http://travisnietert.com/uploads/1/3/0/5/130544318/ea3b3a.pdf
    • http://campbelllaneengraving.com/uploads/1/3/0/2/130270967/xegobetija-bokazivejuko-kunenubupiruxe.pdf
    • http://trainevryday.com/uploads/1/3/0/6/130620963/madisodidol.pdf
    • http://hoodday.org/uploads/1/3/0/2/130289803/tabipegovoter-nezolofirol.pdf
    • http://hoodday.org/uploads/1/3/0/2/130289803/tabipegov
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071b0.bin
011693b626423370608cfe88ee902b04a5caa0c9cf6e8352e2b32805d55cdb7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71B0 8512 bytes
font_01_sfnt_off00009273.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9273 16036 bytes

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