Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d37b130da9dc0df…

MALICIOUS

PDF

40.1 KB Created: 2020-11-06 00:49:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a5bb7c0f039107fa3ac0400bfc0186a3 SHA-1: 99dd86d8b651d78b03ba73a654da525741aef357 SHA-256: 9d37b130da9dc0dff6c168b5a980f42a8fa624d93589c5316fc5ca2788c8695e
192 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 and redirector services, indicating a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports the lure tactic. The primary redirector URL, https://gettraff.ru/strik?keyword=civilization+6+android+apk, is a strong indicator of malicious intent, likely serving as a gateway to malware or phishing content.

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.
  • 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.
  • 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=civilization+6+android+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384036/normal_5f8d666ab5581.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379230/normal_5f8b24aa538b8.pdfIn PDF document text
    • https://zoxaminajoge.weebly.com/uploads/1/3/1/6/131637873/doginoxitexeret.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379718/normal_5f90fbe03a1c3.pdfIn PDF document text
    • https://razezoxuwen.weebly.com/uploads/1/3/1/4/131453099/5336667.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376598/normal_5f907a19ae48e.pdfIn PDF document text
    • https://rikidunojig.weebly.com/uploads/1/3/4/4/134488605/0a5879a5173.pdfIn PDF document text
    • https://repotadidutu.weebly.com/uploads/1/3/4/3/134310826/fekolizodidumom_xomitekoxokiru_najez.pdfIn PDF document text
    • https://wijimoki.weebly.com/uploads/1/3/4/4/134485243/9409171.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374178/normal_5f902fba75ad1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392656/normal_5f978bdf41f21.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/fe906125-a8fe-429c-8430-608327a5377f/pasub.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/computer_full_form_of.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc1b271a-6564-48b9-875b-8824a01fbdac/voxowi.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/36208592636.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_off00005ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5ADA 5008 bytes
SHA-256: 0986ad1f4b24262c17fd1eb329019310fbd7f0e8ab10d9d3c466f0d981f3e695
font_01_sfnt_off00006bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BFE 11776 bytes
SHA-256: ae854c9a7a92810328007285995f729ad6414421c23557c3edc2202785a01afc

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