Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f3f9b27fc07ecb4…

MALICIOUS

PDF

46.6 KB Created: 2020-11-05 07:04:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a2859e12f942f227a5860fe74e6d395b SHA-1: 229a9885c4e5f87f70dcd59d09ed4ad99bc3d89c SHA-256: 2f3f9b27fc07ecb4fb3c42caf6bf2fc6a266e52863133d097ab67e28368c5f48
132 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gettraff.ru/strik?keyword=it+drive+mp4 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374686/normal_5f8b1f99dbc60.pdfIn PDF document text
    • https://mikudone.weebly.com/uploads/1/3/4/3/134370159/sobaxorubugozakifom.pdfIn PDF document text
    • https://samoxaposem.weebly.com/uploads/1/3/4/3/134361226/8950295.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/1109957.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389108/normal_5fa070f3b0166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368982/normal_5f8a30d9a157f.pdfIn PDF document text
    • https://renesixedobalew.weebly.com/uploads/1/3/0/9/130969137/7937584.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459170/normal_5fa2081045ac0.pdfIn PDF document text
    • https://muzaromiv.weebly.com/uploads/1/3/4/3/134380281/divizizokawas-xonapuzivuzatux.pdfIn PDF document text
    • https://sakuvajavabese.weebly.com/uploads/1/3/1/3/131383602/sepulizebiz.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/be6cb689-3090-412a-80c8-ae69a7d2ca64/34421107539.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df9db404-6ebb-46d6-b244-6a020035ba64/xagilalibemagixego.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c0b6fc5-e12f-45a6-b606-ab03549b72cb/lincolnton_high_school_principal.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6212 4772 bytes
SHA-256: 76ddb08cefdb65fd873a51256d97e6867875b93f03e227c293bbc03a5dfbb626
font_01_sfnt_off0000723f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x723F 11560 bytes
SHA-256: e3b271608237d2c52937b2bf31207a018da2c1aea611f7dd161c79927a792225
font_02_sfnt_off000098b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98B6 16112 bytes
SHA-256: 94a2e64bc7cb242413bf0b9a168543d2d9e66e6da816ec022791ad488a02fc3d

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