Malicious PDF — malware analysis report

Static analysis result for SHA-256 be663bb9e2f8ddd4…

MALICIOUS

PDF

52.0 KB Created: 2020-10-12 15:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 591172d66bd16b96072ae77078715211 SHA-1: d63125fec4699fd21595eda174cad9236854f746 SHA-256: be663bb9e2f8ddd4d5d936779c8eada6f2b1f756ef707e25108af58dbcf9bbf4
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://cctraff.ru/strik?keyword=game+bully+offline+android', is presented as a download for 'game bully offline android' to entice clicks. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, many of which are benign Shopify links, but the primary malicious link is the clear indicator of compromise.

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=game+bully+offline+android In PDF document text
    • http://files.scitc.org/uploads/1/3/1/4/131453252/b5d1a87f7b61a3.pdfIn PDF document text
    • http://togolaxus.somoba.org/uploads/1/3/1/8/131860938/3928185.pdfIn PDF document text
    • http://kuxiro.miweddingpainter.com/uploads/1/3/2/8/132815806/7847985.pdfIn PDF document text
    • http://misoda.lumccdc.com/uploads/1/3/1/4/131410399/voniseduxewu.pdfIn PDF document text
    • https://site-1039711.mozfiles.com/files/1039711/tonotifat.pdfIn PDF document text
    • https://site-1037079.mozfiles.com/files/1037079/midowunasaxerobi.pdfIn PDF document text
    • https://site-1036996.mozfiles.com/files/1036996/55878200626.pdfIn PDF document text
    • https://site-1042287.mozfiles.com/files/1042287/84836637620.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8326/2869/files/basil_cream_sauce_for_chicken.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4927/1975/files/66912089373.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0568/1557/files/39574647779.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/9931/6131/files/16467676336.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d27ee4b-7329-44a9-8f19-f4a96d371b67/dininoku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9113108e-8065-44ac-b8f8-506eab0a75bc/katavusufemugimeguwiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6775811e-6f3e-4096-acff-2c45e994eaae/93057645080.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31c24bab-d339-48a8-bf8d-f5fc76ff0987/sotozitijuwigopami.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DF6 5148 bytes
SHA-256: 7a39a2732a40e2164e81135e0677f788ae814c50f4609bdc14571b5726b5333c
font_01_sfnt_off00009f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F73 10444 bytes
SHA-256: fb5b1bc45e43a5e07f1d20bf83bd260e07bd1dbbdbc5d2614eeae178c3f22ab3

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