Malicious PDF — malware analysis report

Static analysis result for SHA-256 524b2e85df8eaa9b…

MALICIOUS

PDF

45.0 KB Created: 2020-10-15 04:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 11471144b0ff9f532ecfa6498838f1f5 SHA-1: 9592fa370a0dd6098065079531ac057095c0eed7 SHA-256: 524b2e85df8eaa9bd5745a482cf8a13ef73c242ac3154505e6de2ca3853fa0f8
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, cctraff.ru, which is likely used to obscure the final destination and potentially track victims. The document also functions as a link farm, presenting numerous PDF links, likely to appear legitimate or to increase search engine visibility, while embedding the malicious redirector URL. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent.

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/pify?keyword=apkpure+gta+san+andreas In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_5f877e1a9c84e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366313/normal_5f878499dd175.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368481/normal_5f87770cad391.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367621/normal_5f8772aaca75d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367621/normal_5f879c0762e50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366042/normal_5f86ffb7ec5c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5f873d6bedc2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5f86f9fd8af39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366004/normal_5f87036b1eef4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed58c8f9-9b56-401a-a10c-5ef073670baf/58434521626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3127934-b41c-4838-81e5-ed32024960a6/gupajewigaragufix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4397/7366/files/camp_chef_ultimate_turkey_roaster_for_sale.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9465/4632/files/how_to_tp_to_someone_in_minecraft_java.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98a492fa-10b1-44e6-bf26-95c6a6f35316/luzenoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd7d8f71-944e-43e6-83c5-26e5c9574cc9/87124533338.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a39c09e-ba02-4d14-9b11-8b866081028f/26583109878.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_off0000728e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x728E 5148 bytes
SHA-256: 8335f629e6f4ccf3b8361c3fdea2d593d7aad4ff2f9365056305fb8804c80752
font_01_sfnt_off0000841f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x841F 10128 bytes
SHA-256: ad7ca3d5503b8c3d7a0901956da5c2afca2fa23a5cdaec79a5b532ea6be6d2ab

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