Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f1daf793ab4e6d…

MALICIOUS

PDF

35.5 KB Created: 2020-04-07 09:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: eac420c8d7aead100151d6cc30bccd75 SHA-1: 210fbd58175b67aca45d18e77a82033bdcfc28b0 SHA-256: 88f1daf793ab4e6d55660c2b782f6ed868ab669900de0b3a6fcf9785c2679e25
96 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are structured as SEO link farms. The document body and heuristics indicate a lure related to a 'Ncees fe civil practice exam', directing users to potentially malicious URLs. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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://rwccontractingservices.com/uploads/1/3/0/7/130774977/130774977.html#ncees+fe+civil+practice+exam
    • http://onenoisystreetcar.com/uploads/1/3/1/0/131070035/4009917.pdf
    • http://808computertricks.com/uploads/1/3/1/4/131407918/8dbd8.pdf
    • http://newnatureinc.com/uploads/1/3/1/4/131409442/1352001.pdf
    • http://dogtownrva.com/uploads/1/3/0/2/130270903/52b347017.pdf
    • http://hostmaster.ballyroneycottage.com/uploads/1/3/0/6/130620772/ef018.pdf
    • http://northatlantadreamhomes.net/uploads/1/3/0/5/130588214/sutovarupiro_fegugu_kalobeworemido_poxuvuvagojuzu.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_off000062d4.bin
26e732bc76e22d419ccab6385605c162693c3ed7c6a2864020c099803fb30abf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62D4 7984 bytes

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