Malicious PDF — malware analysis report

Static analysis result for SHA-256 fafcaaa43af50b9b…

MALICIOUS

PDF

39.6 KB Created: 2020-04-07 23:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1218792ad77244a6a80c838466b1b19f SHA-1: 8d26f05e184905303625041e063335176d3f8930 SHA-256: fafcaaa43af50b9bca14fb6dd472c3ffced75f7a8fd9580f7d5b6f7c4a9c7632
94 Risk Score

Malware Insights

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

The PDF document contains numerous external links, a common technique for SEO link farms or phishing lures. The document body, though heavily obfuscated, contains a URL that appears to be a dating-related lure. 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 0.9996

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://gametimegrub.org/uploads/1/3/0/5/130588658/130588658.html#mujeres+en+cuba+buscando+pareja
    • http://abcschuetzen.com/uploads/1/3/1/4/131453137/zemolemudaxivuwuz.pdf
    • http://carolynholder.com/uploads/1/3/0/8/130813059/a30cc102d0fcfe7.pdf
    • http://ardenttactical.com/uploads/1/3/0/4/130436367/7b87e48ae6320.pdf
    • http://whitegoatenterprises.com/uploads/1/3/0/3/130379173/xikozowonatiditela.pdf
    • http://jaredgates.com/uploads/1/3/0/2/130288465/perajativ_koxebagax_xevixibajogiz_makolek.pdf
    • http://sagebrush-studio.com/uploads/1/3/0/6/130620370/dewuzo.pdf
    • http://theacollection.org/uploads/1/3/0/6/130604636/6519911.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065de.bin
3a44f372303437a92ef4ce52abe110c00aac5084759144990456dda9d70e8e7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65DE 8992 bytes
font_01_sfnt_off000086a4.bin
915baeb1e29b1296448dc25187851e9706b77add1d29a836586dd6d4826066cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86A4 2600 bytes

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