Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a9af939304f5330…

MALICIOUS

PDF

37.8 KB Created: 2020-04-27 00:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 38adbe7bf45d88acb746de584534091d SHA-1: 78c517187d6a5b64778c92149d7bda824f03177e SHA-256: 3a9af939304f53302f0eae85914bd7110d09d3929fb500942e2cd662a4e7b4be
94 Risk Score

Malware Insights

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

The PDF contains numerous external links to other PDFs hosted on various domains, indicating a link farm or redirection mechanism. The primary lure appears to be related to 'Android payment gateway api', suggesting a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, supporting the observed link farm behavior. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://richkane.biz/uploads/1/3/0/5/130541004/130541004.html#android+payment+gateway+api
    • http://togetheryoga.net/uploads/1/3/1/4/131454500/62aff82a.pdf
    • http://phunseafoodbar.com/uploads/1/3/1/4/131453109/f2d3b05.pdf
    • http://austingaragescreens.com/uploads/1/3/1/4/131452880/3448414.pdf
    • http://odenlovespaz.com/uploads/1/3/1/3/131379274/lazidojili_neros.pdf
    • http://cleancellphone.com/uploads/1/3/0/7/130739754/nozidodikagoj.pdf
    • http://talarium.net/uploads/1/3/1/4/131483076/3075427f.pdf
    • http://metznik.com/uploads/1/3/1/4/131453527/jonux_sepapegived_bajurukotomuve_bakufinawi.pdf
    • http://ernestjgrossood.com/uploads/1/3/1/3/131383546/zojavumejifo.pdf
    • http://creativityismagic.com/uploads/1/3/0/2/130271111/325692.pdf
    • http://nelegeerinckx.com/uploads/1/3/0/5/130543351/fubatutugaravi.pdf
    • http://pcs1.com/uploads/1/3/1/4/131409098/masijudubara.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_off0000683b.bin
6dff863983856499317e37c4374b95443136fc04e88851583b3a0b8703b4a6f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x683B 9304 bytes

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