Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3293acc9ce7ab8b…

MALICIOUS

PDF

34.8 KB Created: 2020-06-12 16:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ee7b1f4349f46a2083c290b341152a7 SHA-1: 6be2992c9f43aa7f5fb5813c67977272d0e3e39e SHA-256: b3293acc9ce7ab8bd2e8875b40251b27aee8e1a145822cdc979a84ff979208bd
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files on various domains, which is indicative of a link farm or SEO manipulation tactic. The document body, though partially corrupted, contains text related to math games and application metadata, 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 direct users to potentially harmful external 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://dirtyharryserotics.com/uploads/1/3/1/4/131437412/131437412.html#jogos+de+matematica+4+ano+multiplica%25C3%25A7%25C3%25A3o
    • http://architectsmarketing.org/uploads/1/3/0/6/130620667/f2cb081a3.pdf
    • http://spiritualdirector.life/uploads/1/3/0/7/130739756/xifoxutimulapa.pdf
    • http://thealchemistdesignlab.com/uploads/1/3/0/7/130740164/7902271.pdf
    • http://fayretradeuk.com/uploads/1/3/1/4/131437693/42be32a8971eb3.pdf
    • http://sweetmaddies.com/uploads/1/3/0/6/130640102/6788599.pdf
    • http://servicesgoglobal.com/uploads/1/3/0/5/130589133/8327372.pdf
    • http://queenofthekeys.com/uploads/1/3/0/9/130969503/pebuze_nebebup.pdf
    • http://d1uxc0.bdgct.com/uploads/1/3/1/3/131379792/gugemo.pdf
    • http://grantmoretime.com/uploads/1/3/0/2/130271126/87ef136dea.pdf
    • https://xazekune.files.wordpress.com/2020/06/zegunawugedanakipemeruwor.pdf
    • https://xipibutepu.files.wordpress.com/2020/06/miriwozixu.pdf
    • https://saziwiri.files.wordpress.com/2020/06/70320535069.pdf
    • https://runokuxuzeni.files.wordpress.com/2020/06/82989493943.pdf
    • https://gajimulozu.files.wordpress.com/2020/06/69730687556.pdf
    • https://niteperozis.files.wordpress.com/2020/06/68930983082.pdf
    • https://komoziri.files.wordpress.com/2020/06/57507950567.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_off0000591f.bin
c57560792a9341e5e5c10e0e2e6e0bd10266428a66066db29d7e06c8ffecb033		 pdf-font-stream PDF embedded font (sfnt) at offset 0x591F 11532 bytes

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