Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4b4856e1b2c316…

MALICIOUS

PDF

41.4 KB Created: 2020-11-07 21:36:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: bbf43b8948663002fc1c2dc5897fe9ae SHA-1: 29bf5834d0acf41c59da7051bedee5e043d86cf5 SHA-256: fc4b4856e1b2c31698df97aabe4b53fae80965ae9a393c4669f49b1750af0f5d
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document is designed as a credential phishing lure, impersonating Facebook to trick users into recovering their accounts. It contains numerous links to disposable hosting domains, including a known malicious redirector at 'https://cctraff.ru/aws?keyword=how+to+recover+a+jp+dokkan+account'. The ML classifier strongly indicated maliciousness, and the document's content and structure align with credential harvesting tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://lozulijulejibog.weebly.com/uploads/1/3/1/8/131857057/3970791.pdf.
  • 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/aws?keyword=how+to+recover+a+jp+dokkan+account In PDF document text
    • https://lozulijulejibog.weebly.com/uploads/1/3/1/8/131857057/3970791.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/nelitop-lerunolalikowu-gisawedutijifuf-mepaxinawewulex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380229/normal_5f9fa0410e4b4.pdfIn PDF document text
    • https://xigokerurubupa.weebly.com/uploads/1/3/4/3/134312623/7224954.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391319/normal_5fa3b979df38c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369150/normal_5f915a1851deb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365540/normal_5f8733bf3999c.pdfIn PDF document text
    • https://bafafodalub.weebly.com/uploads/1/3/4/3/134367540/2e22e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368506/normal_5f912b214523c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368999/normal_5f88bea11bfe1.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/8a97e581-de3b-4f34-a1f1-e94fce2896d2/66078122007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5c58a81-c423-4624-8a20-4ac4612d233c/48375155507.pdfIn PDF document text
    • https://sazaxasegu.files.wordpress.com/2020/11/vizude.pdfIn PDF document text
    • https://lukamukiza.files.wordpress.com/2020/11/play_minecraft_for_free_unblocked_at.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_off00006418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6418 5108 bytes
SHA-256: 96dc678d0a7aae108a91d75a169c7e08d04c5e6dccfb25fc599fe1e02a2d1c96
font_01_sfnt_off000075a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75A2 10196 bytes
SHA-256: d1063fad96b95fd534b2cd296677b4a7ace41474267ab80548a574a5794f26a7

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