Malicious PDF — malware analysis report

Static analysis result for SHA-256 804463cd8b7c77c8…

MALICIOUS

PDF

126.5 KB Created: 2020-04-30 13:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: da2b8443f55235a7161eb64aaafeb680 SHA-1: c8abb1f2b38731eec6ff81dde258c7af9bec9827 SHA-256: 804463cd8b7c77c82614d6a1589ae76aa213d4db416f11a43d9032664c2a7922
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 similarly structured URLs on different domains, indicating a link farm or distribution network. The document body text, though heavily obfuscated, contains references to 'Fraggle rock music sheet' and metadata from wkhtmltopdf, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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://writingshapesthinking.com/uploads/1/3/1/6/131636719/131636719.html#fraggle+rock+music+sheet
    • http://accountrust.info/uploads/1/3/1/6/131606577/8a621c6d.pdf
    • http://mmracing20j.com/uploads/1/3/0/5/130589207/60f775bf60ee79.pdf
    • http://kripalutarot.com/uploads/1/3/0/6/130639901/lezasabasido_wikupovolipikiz.pdf
    • http://hccvermillion.net/uploads/1/3/0/2/130270873/vojifi-dobenasekim.pdf
    • http://trinitydelights.com/uploads/1/3/1/4/131407796/lasudunewefiju-fuwaxixowamukul.pdf
    • http://utuppercervical.org/uploads/1/3/0/4/130483200/088a2e81515f.pdf
    • http://hibernianbpo.com/uploads/1/3/1/3/131398242/xojuvitike_wonokumakixe.pdf
    • http://fabulashbyher.com/uploads/1/3/0/4/130483656/3733183.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a540.bin
b0bc62db5fc688bef6c28734bee6fefa86701b54b2f14836458b18971a17ac22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A540 10476 bytes
font_01_sfnt_off0001cc42.bin
874041c41796a4189cb161ffc14ced59b8a11ee864356eb2223002d2e3818fed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC42 3032 bytes
font_02_sfnt_off0001d6f3.bin
b195ba776360337e0c8847a1f70ebf7e776628c0b6b62df72d82cae76b96cbf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6F3 16248 bytes

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