Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c6f89da32f47238…

MALICIOUS

PDF

41.6 KB Created: 2020-10-12 14:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: e4630374d59b3b9f5faf94e5219f65b6 SHA-1: 4f356bee802ebdf0e5ba93f95baa06d7eb156038 SHA-256: 6c6f89da32f472389ac79ec713a9b75041d163d53705bb369f5436e4a9213946
124 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically `https://cctraff.ru/strik?keyword=stop+barking+dog+app+android`. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to trick users into visiting it. The ML classifier strongly flagged this PDF as malicious, and multiple heuristics indicate it's part of a link farm on disposable hosting, reinforcing the 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=stop+barking+dog+app+android In PDF document text
    • https://site-1036874.mozfiles.com/files/1036874/timudupuwa.pdfIn PDF document text
    • https://site-1038505.mozfiles.com/files/1038505/53203859336.pdfIn PDF document text
    • https://site-1036987.mozfiles.com/files/1036987/tizovogonovinuzopup.pdfIn PDF document text
    • https://site-1039748.mozfiles.com/files/1039748/tunorasuxogosawosaku.pdfIn PDF document text
    • http://files.fertigvilla.com/uploads/1/3/1/4/131482887/kapez_lusaso.pdfIn PDF document text
    • http://jemiw.dart-bayernliga.com/uploads/1/3/2/6/132695832/4158616.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/8ec09181-1a11-4ca7-a147-2361251e161d/28362936912.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b9ca666-fc5e-4b19-977d-5992f7fc63eb/dexiwinuzumudidudab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70f9fc3b-a9f8-4505-9150-7efa5e2699dd/32477358631.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9687/3885/files/lincoln_park_seattle.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/2484/6495/files/ars_magica_3rd_edition.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_off00006528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6528 5224 bytes
SHA-256: d9efb9315b1e951d20d3fe401ffffddf3c7e5ab08eaaf3ea8a01732a51cda439
font_01_sfnt_off000076ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76EE 10276 bytes
SHA-256: 76108e591fc542e1af65de753c2a57695b61d56b2c263f6d388b8bfa282b2929

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