Malicious PDF — malware analysis report

Static analysis result for SHA-256 754bc7941c78b8bc…

MALICIOUS

PDF

39.1 KB Created: 2020-11-01 00:46:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 246eb52ad9c0981b215e26e096ab313e SHA-1: 2d4916e731c4a7235adfeea268b5ca19057a838e SHA-256: 754bc7941c78b8bcb9dee05b93f801f36728ab32101a0a7fdf91e14b80979980
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document employs a social engineering lure, instructing the user to install a browser extension or update to view content. It contains embedded links, including one pointing to known malicious redirector infrastructure at https://cctraff.ru/123?keyword=shortcut+for+close+tabs+to+the+right. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it functions as a link farm on disposable hosting, further supporting its 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/123?keyword=shortcut+for+close+tabs+to+the+right In PDF document text
    • https://zolezuborejizo.weebly.com/uploads/1/3/4/4/134444688/wisofobejore-nowalisulu.pdfIn PDF document text
    • https://mukokoloraji.weebly.com/uploads/1/3/4/1/134131612/morot_nodepuzafo.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/4135560.pdfIn PDF document text
    • https://zanelonovubut.weebly.com/uploads/1/3/4/3/134315015/xafikaseritunu-dasub.pdfIn PDF document text
    • https://lerexujirizafet.weebly.com/uploads/1/3/4/3/134344290/6941104.pdfIn PDF document text
    • https://worobewunit.weebly.com/uploads/1/3/1/4/131406731/roxuwadefobok-palireva-tuwuxovunini.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/bde2cefe-e4d8-4fca-8e62-bec19a2352a0/67708622432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/016e61f4-1287-4468-8d64-f11e535fb9d8/67679299697.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/9125/6007/files/pemosobojibawim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c00c4302-07cb-415c-af65-3287423b3c55/gozugamefujezebako.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/6234/3862/files/comer_arroz_crudo.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/nipolevinowupexatoropozin.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_off000058e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58E3 5384 bytes
SHA-256: 6656c8f8fc091353f6a33e7cd90dabb5f4aaa394af5b490bea54420b5d6dda94
font_01_sfnt_off00006b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B31 10680 bytes
SHA-256: 6bb35cfa7840e739bcff1c9e59790771a1ff046a7ac24d963a4afaf22f6137ee

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