Malicious PDF — malware analysis report

Static analysis result for SHA-256 abed02730e6f5fa3…

MALICIOUS

PDF

36.6 KB Created: 2020-04-10 20:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dfbe2c04792b62b24c4aab3c632467d2 SHA-1: b16d001f568b2be4a697052926fa9126cb1e52ab SHA-256: abed02730e6f5fa352c521859b5bab1a3eea3e12b98564ef75ed007dfc02cf04
96 Risk Score

Malware Insights

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

The PDF document contains numerous links to external PDF files, presented as a lure for a free game. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, and the ML classifier strongly flags this PDF as malicious. The embedded URLs likely lead to further stages of the attack, such as credential harvesting or malware delivery.

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://quartzvanitydirect.com/uploads/1/3/0/2/130289428/130289428.html#amnesia++free+full+game
    • http://dtukajak.dk/uploads/1/3/0/4/130490488/zizuf_sixoferuro.pdf
    • http://movemybrand.com/uploads/1/3/1/4/131406607/2005759.pdf
    • http://s-p-q.org/uploads/1/3/0/6/130603873/nuditigigivoze.pdf
    • http://complicatedinc.org/uploads/1/3/0/6/130620700/8932181.pdf
    • http://thehurlingbag.com/uploads/1/3/1/4/131436981/856a090d.pdf
    • http://customercongress.ru/uploads/1/3/0/7/130776177/ritabunojuzisam.pdf
    • http://thefreemenhouse.org/uploads/1/3/1/3/131381231/5155255.pdf
    • http://danispt.com/uploads/1/3/0/4/130435596/7838172.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_off00006549.bin
b298520845747d0f3010c282b1426f9d05126248c18f5dd53a3e0dfe4afa028e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6549 8060 bytes

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