Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a7bfb02cfd70eb…

MALICIOUS

PDF

52.6 KB Created: 2020-10-27 11:59:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 354131a459a8e8e0216b9f893eb8ea49 SHA-1: 2c51a18d89ddbe41c78652a4beb1255d7f338fe6 SHA-256: 27a7bfb02cfd70eb7f6db94fb4bc73a43ed5b547cbd7f09b9f8291fef6144540
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links pointing to external PDF files hosted on various disposable domains. One of these links, https://gettraff.ru/strik?keyword=nanda+list+2018, is identified as a known malicious redirector. The overall structure suggests a link farm designed to manipulate search engine rankings or distribute further malicious content, with the embedded URL being a primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=nanda+list+2018 In PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/tebuwimemepure.pdfIn PDF document text
    • https://wefejakero.weebly.com/uploads/1/3/0/8/130814310/e6064b5a.pdfIn PDF document text
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/weligatoreso_gopilanimogan_jitibi.pdfIn PDF document text
    • https://busozovamifolak.weebly.com/uploads/1/3/4/2/134235369/bdd3d5cc.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/popelem.pdfIn PDF document text
    • https://bewupoterefi.weebly.com/uploads/1/3/1/3/131380107/pexivo.pdfIn PDF document text
    • https://sixapinipuso.weebly.com/uploads/1/3/1/3/131384402/d9297fbe49d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366365/normal_5f8bfd85e16a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372681/normal_5f94208fa6603.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/b2bd0964-1f07-4885-9d74-adeb4635070a/80920147801.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cc5aecf-731a-4ca2-ae1a-61c8ff46eb28/44105749548.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9590e9d-1d3b-445c-bf94-3de1915275ec/kirepivimafagetupubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f884cd97-9cfc-49d9-bdac-cd1a8e99a6b2/takuvin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2de4c68c-717c-4ebf-b128-e3d6d11b8338/j_cole_no_role_modelz_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31a554a2-6f7a-449b-84d0-c1d2e429a1bf/91966968765.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ed90f79-1022-4682-a94b-3a671049addd/8114803237.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6ec3c42-2a4c-44cb-aa30-1593f8c24a80/defudosifol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7766b1f6-a332-4deb-aade-bc024ace51fd/mathematical_models_by_richard_haber.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e273769a-6287-404a-a4d8-70ba1b84aeb6/corel_draw_x8_keygen_password.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_off00008fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FC5 5212 bytes
SHA-256: cdc77a9b4418066892a0c646bb1fd5cd6546770e641e55c01e92ef7b597b02a2
font_01_sfnt_off0000a18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA18E 10588 bytes
SHA-256: 7fdb0215ffa63b33fd6f17e0287dcff47985577e098fb161390c48d4e2db54a4