Malicious PDF — malware analysis report

Static analysis result for SHA-256 c92f769b8f135739…

MALICIOUS

PDF

44.4 KB Created: 2020-10-28 15:05:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: dffe3c768ffea4c3c2a3608a8ab91f31 SHA-1: e64630d84ccbc7b824935dda1d4e6c9752d09b8e SHA-256: c92f769b8f135739eb2be20fdcdd274a0c367f04e577207f6faaf2856afc2f5f
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains references to URLs that are part of a link farm. This suggests the primary purpose is to redirect users to malicious content or to manipulate search engine results.

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=whitechapel+documents+of+contemporary+art+pdf In PDF document text
    • https://jodobape.weebly.com/uploads/1/3/4/3/134317169/tojapun.pdfIn PDF document text
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/270f5c.pdfIn PDF document text
    • https://mimasalidapu.weebly.com/uploads/1/3/4/4/134466186/lafugor.pdfIn PDF document text
    • https://gonoloxezejuje.weebly.com/uploads/1/3/1/4/131410007/9778880.pdfIn PDF document text
    • https://pinonomobeberex.weebly.com/uploads/1/3/4/3/134318871/zavumulajow-jozenuliwize-zotexa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369909/normal_5f8ba899c4e41.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/lipixalog_romaxodewuj_lurajuwosoruvof.pdfIn PDF document text
    • https://bilewobadazape.weebly.com/uploads/1/3/2/6/132695578/xagolopom.pdfIn PDF document text
    • https://wipomozexabezi.weebly.com/uploads/1/3/0/7/130776841/kupoxenegavo_rowefipimesoge.pdfIn PDF document text
    • https://senobatupubem.weebly.com/uploads/1/3/1/4/131437889/d8b4b6a.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/09b03b.pdfIn PDF document text
    • https://vodiwisilob.weebly.com/uploads/1/3/2/6/132681054/2543024.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/4863/9897/files/preschool_worksheets_letter_z.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/1262/6855/files/gimixeviwifubeda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5319/4152/files/2020_toyota_prius_two_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/oedipus_the_king_full_text.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/5312/5284/files/buponivoremopowewokejox.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/gozisikuwuvukisavaserig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5178/6145/files/materi_kanker_serviks.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_off00006c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C4C 5508 bytes
SHA-256: f5536f1591c2a57647bb7173d2922e7a70e8f0fb6d8b867d0edbf8baead1e378
font_01_sfnt_off00007ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF1 11064 bytes
SHA-256: ea087a94f6c664e3802ef1bbd5b301cd05d94b6fcbe2cb427fcb57858056d423

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