Malicious PDF — malware analysis report

Static analysis result for SHA-256 af93d9fe98240328…

MALICIOUS

PDF

38.2 KB Created: 2020-04-15 09:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2df23483974266de465c39a55ed35b30 SHA-1: 15a7fb34cadb363620de1523102a055e8f3a5853 SHA-256: af93d9fe98240328dacf8fd107d8be23c690dfc05e4e87e3fa3cbb729085650b
94 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a significant number of external links, characteristic of a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains a URL pointing to an external HTML file, which likely serves as the entry point for the attack. The presence of numerous PDF links hosted on various domains suggests a coordinated effort to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://floralfaeriedesigns.com/uploads/1/3/1/4/131405948/131405948.html#america+america+kannada+film+video+song
    • http://hypecopp.com/uploads/1/3/0/4/130435914/terifozagot-bavupefujeju.pdf
    • http://torustarot.com/uploads/1/3/1/3/131382406/c79b8032.pdf
    • http://capitolhillclubmembers.com/uploads/1/3/1/6/131636866/nelamomelenuke.pdf
    • http://ersteversiontanja.com/uploads/1/3/0/6/130620395/nezasuvus.pdf
    • http://rochesterlistens.com/uploads/1/3/0/6/130620646/jemunuf.pdf
    • http://rwconsultingservices.ca/uploads/1/3/0/7/130776223/nibukixali.pdf
    • http://crispysteam.com/uploads/1/3/0/4/130476048/4572480.pdf
    • http://ronococonsulting.com/uploads/1/3/0/7/130739718/339c5e0cd77ce13.pdf
    • http://ronococonsulting.com/uploads/1/3/0/7/130739718/339c5e0
    • 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_off00006a92.bin
56a86fe94cc1957187d383e839ee323cad7c7c3822260c13c7dc047be25a490e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A92 9112 bytes

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