Malicious PDF — malware analysis report

Static analysis result for SHA-256 7065ca8254daa535…

MALICIOUS

PDF

35.4 KB Created: 2020-11-02 09:48:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3498c3388b29bb012617080f9c94538e SHA-1: 3062afd0567d1b728b4c276b2768bed918e62d5a SHA-256: 7065ca8254daa535a8c659b38bc37a54f0d731d30bc944c9ce5d7df4374ad65c
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting services and one specifically identified as a malicious redirector. The primary malicious URL is https://cctraff.ru/strik?keyword=clover+hill+library+chesterfield, which is designed to lead users to further malicious content. The document's structure and numerous links suggest it is part of a link farm or SEO manipulation scheme to distribute malware or phishing content.

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://cctraff.ru/strik?keyword=clover+hill+library+chesterfield In PDF document text
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/baxobuselun-sifobiser.pdfIn PDF document text
    • https://xakokizape.weebly.com/uploads/1/3/4/3/134343218/bd6b9.pdfIn PDF document text
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/wakenafo_vurebusej_metedorakeru_runuseteni.pdfIn PDF document text
    • https://zafigitelerom.weebly.com/uploads/1/3/4/3/134338481/9180125.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/vutezusarawelakaje.pdfIn PDF document text
    • https://jufukakoxojopop.weebly.com/uploads/1/3/4/3/134317893/rurexefiz-noginapajeg-bimowinosiruga-tewozisowesi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367944/normal_5f8761e61c542.pdfIn PDF document text
    • https://pumowurunumig.weebly.com/uploads/1/3/2/7/132740285/588e72669f93.pdfIn PDF document text
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/xugarasuwifusavalug.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/1/0430/3332/9815/files/36909742383.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/balun_canan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/2538/8460/files/foolproof_module_18_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2775/7216/files/xaran.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/bellawood_hardwood_floor_cleaner_kit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/8294/0061/files/63061573029.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/5324/2264/files/imagery_middle_school_definition.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_off00004a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A88 5316 bytes
SHA-256: 295a0d997c7d3229979985b9cafdb9b32922b887100376da0e4f84528d03cfa9
font_01_sfnt_off00005c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C9C 10652 bytes
SHA-256: bb3478e467fbbd320438f6c6101d8d08d7f37ff33eee4f0ea30e97c43557bf8b

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