Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f8555f3d7b44f2…

MALICIOUS

PDF

44.8 KB Created: 2020-10-28 16:13:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 1cce54bd157e6995e999921b3262ba50 SHA-1: 74c31ac42384f050f3f53d19a0c5b5ebce838786 SHA-256: 11f8555f3d7b44f2c93618fb431f4208a9d6e58ca6578fbb85334796ce521cc7
94 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/strik?keyword=do+all+crustaceans+have+hearts'. The ML classifier also flagged this PDF with high confidence. Although no scripts were extracted, the embedded URL is the primary indicator of malicious intent, likely serving as a lure to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=do+all+crustaceans+have+hearts In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375095/normal_5f962572db1ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415302/normal_5f95c6c14b50d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369508/normal_5f911d7c8a122.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366399/normal_5f956b58cbc80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367312/normal_5f90c9a32f5a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373239/normal_5f8d5b66d5513.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382972/normal_5f91e2e2a173e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424024/normal_5f98b1b2c59aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368243/normal_5f8ec0ffa491d.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/leguvefu/51835548109.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/26761347869.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/xikiduvirozinamox.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/14113950544.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/kofomojumuruwajoja.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/andhra_pradesh_reorganisation_act_2014_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/9062277791.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/kopeweruxamosuwano.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/fazeligukimegasepuvu.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/7261205516.pdfIn PDF document text
    • https://s3.amazonaws.com/wejalixex/17_age_of_consent_illinois.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/une_vidence_agnes_martin_lugand.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_off00006eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EEB 4944 bytes
SHA-256: 78974f0be5ff733ca4adcf553a7bc097dfe45661ecf5abd6f0f59e17be6f0ad4
font_01_sfnt_off00007fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FBE 11160 bytes
SHA-256: 4292b5efcdcc6754ae29da2aea21a604aa3dc7636b9bc45b4c0b80aa3013b31b

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