Malicious PDF — malware analysis report

Static analysis result for SHA-256 933f57f262b608e1…

MALICIOUS

PDF

43.3 KB Created: 2020-11-07 02:23:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2bc8687347abc8aff2e81f76aa794b0e SHA-1: 281405533bd9dd18338996083bfbc8a27199e05d SHA-256: 933f57f262b608e153fe4adbcc45a7554cdd82027e6ce8f024c3653fd52923cc
86 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document uses a cloud document lure, impersonating services like iCloud to trick users into clicking embedded links. The heuristic 'SE_CLOUD_DOC_LURE' and the presence of external URIs like 'https://trafffe.ru/aws?keyword=icloud+desktop+app+windows+10+download' strongly suggest a phishing or malware distribution attempt. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/aws?keyword=icloud+desktop+app+windows+10+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387061/normal_5f8d731aca9d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369905/normal_5f8c3ece6c18e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5f89b98470cc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366402/normal_5f9ee7269a29d.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/nugedub.pdfIn PDF document text
    • https://jamafijuzu.weebly.com/uploads/1/3/1/4/131437216/9ca2380.pdfIn PDF document text
    • https://geredape.weebly.com/uploads/1/3/4/3/134349068/99e9f463185fff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://bopugixuja.files.wordpress.com/2020/11/gifinesawixedupe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d231d556-be62-45d0-bc8d-ca08c392e586/11140532606.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6896b6d5-1208-44e5-a3c2-edfbbdcd9b14/87911549519.pdfIn PDF document text
    • https://rukawakoxofo.files.wordpress.com/2020/11/davinci_resolve_16_shortcut_cheat_sheet.pdfIn PDF document text
    • https://wupomasaxo.files.wordpress.com/2020/11/nifazejimow.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CF7 5140 bytes
SHA-256: 41f14b22d2a04b5709c675963e28b1ab4a147a70c25ade4637efa41dd72b398c
font_01_sfnt_off00006e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E8F 10484 bytes
SHA-256: 51b300cf72d93a706ce7011561c6a7fa1f30f829ada82b589c598cc0cd9a141e
font_02_sfnt_off00009260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9260 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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