Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a3e9b72949893c…

MALICIOUS

PDF

41.6 KB Created: 2020-11-08 03:39:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: cabc0edabf118c6e54268224205955fe SHA-1: ed1cdde01f9f2d882dddd75810bbdffe9804c74c SHA-256: 87a3e9b72949893c0fd512c04c40c3c82204d9629b320943db2a75cd5f04aebf
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/123?keyword=los+censores+in+english In PDF document text
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/xewitapin.pdfIn PDF document text
    • https://kulirudezu.weebly.com/uploads/1/3/4/5/134583820/08a4254dd7.pdfIn PDF document text
    • https://befekibeje.weebly.com/uploads/1/3/4/3/134319248/funidutusuweset-famesu-nudegod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369318/normal_5f970f68870eb.pdfIn PDF document text
    • https://vupavekana.weebly.com/uploads/1/3/4/4/134493500/1fa720617bc36.pdfIn PDF document text
    • https://botubadixebom.weebly.com/uploads/1/3/1/4/131407995/1133cb5d06645.pdfIn PDF document text
    • https://sabidodavo.weebly.com/uploads/1/3/1/4/131408103/lovudujapud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/tabular_integration_by_parts_calculator.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/51929662918.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16a5a937-de9e-46bd-a97b-053f2813327f/wolidajisalisirusopivu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a4ba88b-948b-4d0c-8c2e-f04f4319a100/algebra_1_midterm_study_guide.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_off000064f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64F7 4792 bytes
SHA-256: 5e1e0bb20d63979c7e76621a5eb79c3dd33bd579c96dfdd870bb2dd4041aacd4
font_01_sfnt_off00007543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7543 11220 bytes
SHA-256: aabd704f19ef7206f518d706e534b8f7e1a775280e010e77acac78044b60fef1