Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c7b5f5efb688183…

MALICIOUS

PDF

36.1 KB Created: 2020-11-02 06:39:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df8f690fcf5f12b68c50399778e5b27e SHA-1: 172f870104bd595b0c4eab8de94658607efaa7bf SHA-256: 9c7b5f5efb6881834b3003f9e9621a658d6b658138d27df69a7da961318df4b0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one specifically identified as a known malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and other benign-looking PDF links, suggesting a tactic to lure users to malicious infrastructure. No scripts were extracted, but the PDF structure and link farm heuristic indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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 https://ggtraff.ru/123?keyword=denton+high+school+basketball+coach
    • https://cdn-cms.f-static.net/uploads/4406809/normal_5f987a1eec8eb.pdf
    • https://rakamukomegu.weebly.com/uploads/1/3/2/6/132681656/linisimiwovane_mewomajudam_nojupogifuvuxef.pdf
    • https://cdn-cms.f-static.net/uploads/4393759/normal_5f90e7ac4d9d9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0487/9246/9669/files/18303864181.pdf
    • https://uploads.strikinglycdn.com/files/3aaae4eb-2e48-40de-b39f-805cb2a322f0/determinantes_y_pronombres_indefinidos_ejercicios.pdf
    • https://cdn.shopify.com/s/files/1/0502/0749/0199/files/tupom.pdf
    • https://uploads.strikinglycdn.com/files/9137d111-dec7-4cdf-ae34-5d05d5b8f911/bitada.pdf
    • https://uploads.strikinglycdn.com/files/4f646a02-93f1-4a18-8d1e-916dfd005718/lepanomibesolibuxe.pdf
    • https://cdn.shopify.com/s/files/1/0438/9725/8136/files/enchilada_hannover_speisekarte.pdf
    • https://cdn.shopify.com/s/files/1/0430/4361/8965/files/home_depot_employee_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0501/6361/3853/files/alegoria_de_la_caverna_hoy_en_dia.pdf
    • https://uploads.strikinglycdn.com/files/fc320d6f-e0e4-474d-b2b2-5199ce7382fa/zedikiwixipuroxesa.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000052d5.bin
62c7c1c63ec8ccdefddd0c158013084830dbe5c54f213f649dc3854681236e9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x52D5 5168 bytes
font_01_sfnt_off00006473.bin
466f46ec6c0227e65a9694a08b73fb286c20388078ccabcefa934550ac5e785b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6473 9212 bytes