Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5bce6b8dcc6176b…

MALICIOUS

PDF

34.0 KB Created: 2020-11-03 04:42:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b7b6ce27d8293603fbd139f956460253 SHA-1: d48ed9415ff671c44caa676bd98a36cebd2837fc SHA-256: b5bce6b8dcc6176b751992301cf5081e1ef7a5399294b0eb7dc1cd3d89498800
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://cctraff.ru/strik?keyword=world+regions+map+quiz', is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL and appears to be a lure for a quiz. The presence of numerous other PDF links suggests a link farm or SEO poisoning attempt to distribute malicious content.

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=world+regions+map+quiz In PDF document text
    • https://cdn-cms.f-static.net/uploads/4386622/normal_5f8f23e21ecb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370059/normal_5f9530adc2e63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413118/normal_5f9679f64610c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368736/normal_5f88068a5aaf5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/donake/double_column_cash_book_questions_with_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46c528cd-4f0a-4652-b4f6-cbdae815f9c8/lelaluzev.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/atkins_principios_de_quimica.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/reading_weather_maps_worksheets_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/865f5776-5fb3-478c-b796-6e70aa04637e/1762888598.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/tilivimujuwokobijumorikak.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/90945857266.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/2502/9032/files/which_of_the_following_is_a_factor_of_production_brainly.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_off000046ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x46BA 5468 bytes
SHA-256: 24dbcf0a5100fc3ecd5792e2108a97ecd96a1800ffa3e0bdd7e0afd673888f78
font_01_sfnt_off00005945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5945 9852 bytes
SHA-256: e23e3ed3b210bccff4b4dfb65d3e98906c12e233985b7c6f761b3f45403b8c97

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