Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c40a39edb9de4d7…

MALICIOUS

PDF

45.6 KB Created: 2020-10-13 21:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abd5299771af92837368489399ba55d9 SHA-1: 423ca3b2577247f31bad1ab082ab75fb151bd0d1 SHA-256: 0c40a39edb9de4d78a462f26d9c5f13f78368c9d92e8bb315e15f87c66e9d49d
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to external PDF files hosted on various platforms, suggesting a link farm or SEO manipulation tactic. One of the primary links, 'https://cctraff.ru/strik?keyword=guided+snowshoeing+near+me', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this same URL, indicating its intent is to direct users to malicious infrastructure. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence score support this assessment.

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://cctraff.ru/strik?keyword=guided+snowshoeing+near+me
    • https://site-1038844.mozfiles.com/files/1038844/dobepevatelibasu.pdf
    • https://site-1039456.mozfiles.com/files/1039456/14241254296.pdf
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/tebavu_mofevuz_punoxibera_gijipomole.pdf
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/pejajofedaxevaw_kozadesupuke.pdf
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/lulodegoner.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7e83c03f-d13c-4927-b00c-f4c7cde70060/futixomekoroxawurufo.pdf
    • https://uploads.strikinglycdn.com/files/75c750d1-1f99-41d3-911d-ecff696027ef/17069527231.pdf
    • https://uploads.strikinglycdn.com/files/598c309b-703f-4b86-b9c6-83dc9865f138/74989169367.pdf
    • https://uploads.strikinglycdn.com/files/38580059-a1fb-4dc1-a412-aa4cb77e1359/rifukapobebadawawokuviwa.pdf
    • https://uploads.strikinglycdn.com/files/563d3624-accb-4842-ac33-6c7c5c55a4c5/janovijatuxofeneso.pdf
    • https://cdn.shopify.com/s/files/1/0483/0825/6923/files/dajanogibujenexavisiduf.pdf
    • https://cdn.shopify.com/s/files/1/0487/9748/3173/files/rerotozodidujisifivutif.pdf
    • https://cdn.shopify.com/s/files/1/0429/1549/6092/files/call_of_duty_zombies_2d_online.pdf
    • https://cdn.shopify.com/s/files/1/0482/5435/3570/files/19762174276.pdf
    • https://cdn.shopify.com/s/files/1/0431/5335/8999/files/guxusu.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_off0000737d.bin
38cbfc736203459823b955a64c9b03824812985fda94b920439146fb707b8dc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x737D 5332 bytes
font_01_sfnt_off00008581.bin
3b10b2bfc3b211c035d9b1a1abb90665fbfac0eca2089e4238ef62b8a4d9b132		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8581 10652 bytes

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