Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac703851bc038b71…

MALICIOUS

PDF

34.7 KB Created: 2020-09-30 02:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: a7a8248ca923a415ba003807e99f200f SHA-1: e549926bef1c8052413bd3631380dc66faeed543 SHA-256: ac703851bc038b7137721e110f8f0e253f549dadb0ef4c2ed9edd744dd819e6c
184 Risk Score

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://ggtraff.ru/strik?keyword=have+been+vs+have+gone+exercises+pdf In PDF document text
    • http://saragux.proautomations.net/uploads/1/3/2/6/132681352/wikoluz-jikaka-tenuka.pdfIn PDF document text
    • http://files.beeftubes.com/uploads/1/3/1/6/131637640/dapevufotavo_katuwusizofi_goduwifiwojuru_juzotonaluv.pdfIn PDF document text
    • http://files.orchardhillestate.com/uploads/1/3/1/8/131871505/lojudumepix-rurafafe-regemixewem-gewipamubupaw.pdfIn PDF document text
    • http://baxenapup.wildandbeast.com/uploads/1/3/2/8/132816202/7157550.pdfIn PDF document text
    • http://bekaduv.ianlaidlawlcsw.com/uploads/1/3/1/3/131398008/ratigikiv-punofobi-taxov.pdfIn PDF document text
    • https://site-1036731.mozfiles.com/files/1036731/kigowiwabuxetojaden.pdfIn PDF document text
    • https://site-1037202.mozfiles.com/files/1037202/zuxediratumivurojenomu.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/8e2ad325-81de-41cc-99f0-26b108f1b77b/83830747186.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57cd1ce5-bd9a-4726-af8a-2cb04bc2ce62/33763656626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c80492b-0488-4a09-9b65-f21c24b69af4/jinefexikifeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ebaddbf-b5d4-4527-b076-1f445d4d061c/budedokitobifivul.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_off00004915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4915 5616 bytes
SHA-256: 902fd28ed9ee0b1e9ac99f81242ac069fa6dcb628c6b48490c5b9cbba98e45ac
font_01_sfnt_off00005c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C32 10080 bytes
SHA-256: f9df79f711f96ec173a388369b49bce2b8011617761b998d0768e200449c4493