Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8311407aba0d7c…

MALICIOUS

PDF

42.2 KB Created: 2020-10-29 05:54:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: e10b2125307ffb54b3ca1c966e5ff510 SHA-1: 753568d89bf1e33103c73b5296edb5ecff88ad91 SHA-256: cd8311407aba0d7c5a243239a2873e82cb9b9b2bdae9569892a1f1f79c507ab3
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for pirated content. The presence of many external PDF links suggests a link farm or SEO poisoning attempt to drive traffic to malicious sites.

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://gettraff.ru/strik?keyword=finding+nemo+full+movie+free+stream In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375515/normal_5f8bc9c342a9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369802/normal_5f961fcd1f981.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372358/normal_5f8de21fb6570.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377391/normal_5f8f741e6cf56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375206/normal_5f8ca80424956.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/5e4184ee-f570-425d-9aaf-359f705bcde2/abdel_aridi_grenoble.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1147505c-f25a-496f-be78-c3f96739a554/73014446061.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e34c920-11a9-4e69-9754-eddd30499401/eesha_girisha_naresha_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/17556633592.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a18a09e9-16e2-45e9-8c40-a454dc3e1cc5/phim_tinh_co_tro.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/basic_computer_knowledge_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/mizofusomupigiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c1c1263-ca5b-4663-95d2-94fdb8d79338/vodav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/1932/8424/files/muzzy_in_gondoland_part_1_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f91282e6-a4d2-4536-9d85-c4865bd2623e/62295672713.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/chicken_biryani_recipe_in_malayalam_language.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8083/5765/files/trailer_hitch_extension_for_lumber.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/7481/7693/files/witadu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb255514-4633-40c9-9871-7deb0cf27951/7767251486.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_off0000679e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x679E 5240 bytes
SHA-256: 7df2fe637d431928e67d347618e3216ecc9943c1b544437b13f132c18569a140
font_01_sfnt_off0000796c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x796C 10076 bytes
SHA-256: e99dd8a4734331db1a99a817e8abec275f7ff355fa49989a033c87b16c954f19

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