Malicious PDF — malware analysis report

Static analysis result for SHA-256 444500a8a721ec78…

MALICIOUS

PDF

30.7 KB Created: 2020-06-05 23:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cba445741199fd215dcdf0c96d1639c SHA-1: b02f01916ccec72fb558c14bb26e4272d82d0026 SHA-256: 444500a8a721ec78da8fb9ea608864e9e8d31255fb5b99040f58a9930664c0ff
94 Risk Score

Malware Insights

MITRE ATT&CK
T1598 Stage Capabilities: Host Attack Infrastructure T1204 User Execution: Malicious Link

The PDF file contains a large number of external links, many pointing to PDF files on unrelated domains. This pattern is indicative of SEO poisoning or a link farm designed to drive traffic to potentially malicious content. The ML classifier strongly supports the malicious verdict, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior. No scripts were extracted, but the sheer volume of external links suggests a content-driven attack.

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://cpanel.tigrecolorado.com/uploads/1/3/0/5/130588584/130588584.html#la+grande+aventure+lego+1+streaming
    • http://keatingreunion.com/uploads/1/3/1/4/131438313/7944241.pdf
    • http://2196eh.salon225.com/uploads/1/3/0/8/130814040/4176841.pdf
    • http://lgbtq-kc.com/uploads/1/3/1/4/131408439/4094382.pdf
    • http://gamebouchta.com/uploads/1/3/0/5/130550772/a64a6c6e2d6b73b.pdf
    • http://mail.tyrkiatjenester-eiendom.no/uploads/1/3/0/4/130483682/c11658ceae53d50.pdf
    • http://testchangelawyers.org/uploads/1/3/0/7/130775587/nelirusajewivewi.pdf
    • http://mail.made-by-nature.be/uploads/1/3/0/7/130738553/ba09aa4cb47a7d0.pdf
    • http://cpanel.tigrecolorado.com/uploads/1/3/0/5/130588584/terms.html
    • http://cpanel.tigrecolorado.com/uploads/1/3/0/5/130588584/dmca.html
    • http://cpanel.tigrecolorado.com/uploads/1/3/0/5/130588584/policy.html
    • https://gunusubupele.files.wordpress.com/2020/06/60741405795.pdf
    • https://getosixiwe.files.wordpress.com/2020/06/rokojomobikimarim.pdf
    • https://zavowuboruk.files.wordpress.com/2020/06/buvig.pdf
    • https://masivamup.files.wordpress.com/2020/06/zoranizudusozijij.pdf
    • https://surokukafat.files.wordpress.com/2020/06/zozite.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_off00004cdb.bin
9def9745a9da9811d702f2392b9ead8b3ffbb1b152f01c3699ef4be0f06ae00a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CDB 10104 bytes

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