Malicious PDF — malware analysis report

Static analysis result for SHA-256 136e6ce7c97fb3c9…

MALICIOUS

PDF

43.0 KB Created: 2020-10-16 18:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 73d69291aad81a98bcf9de71d13acca2 SHA-1: 6de2d8ef859902c8b301d3e6b57aa01f94a704d7 SHA-256: 136e6ce7c97fb3c9d6a0e6d5d45fa9c120ae709c21ac7443d5e0cafe17ca81d3
94 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/strik?keyword=intervalos+y+semirrectas+ejercicios+resueltos'. The ML classifier also strongly flagged this PDF as malicious. Although no scripts were extracted, the presence of a malicious URL within the document body suggests an attempt to lure the user to a compromised site, likely for phishing or further malware delivery.

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=intervalos+y+semirrectas+ejercicios+resueltos In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372378/normal_5f8957e70266d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367290/normal_5f8865a1eafcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369486/normal_5f89279d6ce43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366354/normal_5f87205f65bd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372105/normal_5f8900e0d1798.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366362/normal_5f872b8956ab6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367019/normal_5f872b5e692a8.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/kedoxezezaj-temolej-zunemalavorun-mutelokowomimi.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/7775416.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/tebavu_mofevuz_punoxibera_gijipomole.pdfIn PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/lexibefe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3765/4178/files/46978722341.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9587/5989/files/daddy_sylvia_plath_analysis_essay.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/6683/3088/files/gradient_app_android_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9252/3675/files/arithmetic_and_geometric_sequences_practice_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba8084dc-f7be-418d-a73b-2d6a65b9b370/37555174988.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb3fcc70-c85d-4f7a-aad2-317fa3ea4ec2/41942478080.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0bb7352-c100-4518-afa5-20fabd37d70b/jidenis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c492432-745c-4b29-9049-86521539c204/778599894.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_off00005d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D2A 5120 bytes
SHA-256: a140071a4863a2c1b6af4b0dc6cf1e88decd6fa0c8a3623428916fc8719ae203
font_01_sfnt_off00006e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E86 15124 bytes
SHA-256: 2e7805d6bdd34bc421878d9ae7b9a4f13fee7ba7d8c11beeb1467c42be15cb62

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