Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c6f6d509fb537f…

MALICIOUS

PDF

45.2 KB Created: 2020-10-05 23:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 407a167d325ae64222a947113078ac55 SHA-1: d459d046a8a1f3204607efc57305fc6b73cfa794 SHA-256: c1c6f6d509fb537f0b9431a1351485617309452c8d0ee702aae7bc37159f6c25
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical heuristic firing for a malicious redirector, indicating an attempt to lead the user to harmful content. The embedded URL `https://cctraff.ru/strik?keyword=a+current+affair+reporter+arrested` is a primary indicator of this malicious redirection. The ML classifier also strongly flagged this PDF as malicious.

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=a+current+affair+reporter+arrested In PDF document text
    • https://site-1037859.mozfiles.com/files/1037859/kilelusikosibovumoxirin.pdfIn PDF document text
    • https://site-1036730.mozfiles.com/files/1036730/35862639775.pdfIn PDF document text
    • https://site-1037202.mozfiles.com/files/1037202/nizasaxijalavupuwutagevat.pdfIn PDF document text
    • https://site-1037245.mozfiles.com/files/1037245/27619256214.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4253/2247/files/history_of_delta_sigma_theta_sorority.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1beaa0ed-3d77-4d24-8fba-7b4538c43637/12164124189.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3269e86-3e77-492e-ac50-fe80a8660e06/gupoxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46f10e09-36c9-4eda-b1f3-63d7324416da/tazologetegenade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52b9a717-099f-40a2-9c7b-f62f6e92eedd/33393366100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58ff0c75-25a7-4ae9-9c3b-cdd4ff30548b/66136641162.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46c76875-46ef-4a22-9ec5-e3bda3e05855/28729202770.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa582a2d-2e5d-4d72-aeb6-c8a657e70976/44751389772.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bd356d4-2ba7-4b18-88cd-b3c58ea144a9/fezodawoweb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000660b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x660B 4988 bytes
SHA-256: 182b889ae71ee8ec888a55cb9075a121e37e6b8bb39f6d7dccd1108b8b572677
font_01_sfnt_off00007706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7706 10120 bytes
SHA-256: 98acd7872e8054c15f9065cf2f841dbf2b7b651b9415ae55b59099f4a92d4df8
font_02_sfnt_off00009999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9999 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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