Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d14cae97b5047a9…

MALICIOUS

PDF

46.0 KB Created: 2020-10-28 06:49:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5e015c6c21f8072283f91a3ab109146b SHA-1: b3926464271ea2593aa36de5f7c4cb027be67595 SHA-256: 5d14cae97b5047a9598bbd59c2d956b0af450ea5489714ab69929aacb85e5e0b
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://ggtraff.ru/strik?keyword=vizio+60+inch+tv+legs'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, one of which is 'https://uploads.strikinglycdn.com/files/2f16229f-b1fa-4306-b817-0cbe24d74783/equation_of_a_tangent_to_a_circle.pdf'. The ML classifier strongly indicates maliciousness. The document body appears to be heavily obfuscated or corrupted, but the presence of embedded URLs and the link farm heuristic suggest an attempt to redirect users to malicious sites, likely as part of a phishing or SEO-based attack.

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://ggtraff.ru/strik?keyword=vizio+60+inch+tv+legs In PDF document text
    • https://cdn-cms.f-static.net/uploads/4404497/normal_5f92844bb3a9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373797/normal_5f8b41b3c01be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383131/normal_5f98ce7e148af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426407/normal_5f98b0aef2b46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383929/normal_5f8e6bc95ffaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379736/normal_5f8aac6f081e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368958/normal_5f915efdc70ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376127/normal_5f9084880b5d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381971/normal_5f91c9c1e711f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378152/normal_5f90bc58f07d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371508/normal_5f8ce8371289e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_5f8934b1bd439.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365589/normal_5f8a530f614f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375509/normal_5f8facd89e702.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/2f16229f-b1fa-4306-b817-0cbe24d74783/equation_of_a_tangent_to_a_circle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/752073b4-2cdc-41e0-a212-b28a30a2d721/9789730010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/314886de-68b1-4feb-841e-c351e82bf660/82383833205.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e865192e-9288-4617-953e-0c142d1c52d9/zusek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78962a5a-38da-4e04-b23e-033214b2c8df/zusufuruginakudekonatiti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9607/0549/files/97593988911.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/6150/1848/files/bible_teaching_on_marriage.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8204/5858/files/tegobekawubabi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3071/5288/files/darkest_dungeon_bosses_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4876/2529/files/graupner_mz-12_manual.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_off000073e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73E1 5124 bytes
SHA-256: 0782f7191613cabbaa61cc06a0aa62d702bdd97450e8a67d350f719e274d5a95
font_01_sfnt_off00008569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8569 10964 bytes
SHA-256: 34cc8113a595ab56b1a8056ac9b393100997cf1b49e8bccdbcb4e14e3d992711