Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ea27e639b17f3a3…

MALICIOUS

PDF

43.4 KB Created: 2020-10-29 15:48:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 640962773b467ac81d5009b867c42eaf SHA-1: 253e7ae03761e6d6ab371616d858cb68870c73a5 SHA-256: 2ea27e639b17f3a36aa2bcfe71099ab4c87ca49055d2aa86a317ce63aa2f4b37
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a malicious redirector link pointing to 'https://cctraff.ru/aws?keyword=shelby+high+school+basketball', which is a critical finding. Additionally, the document exhibits characteristics of a link farm, with numerous embedded URLs, many of which are SEO-themed PDFs. The heuristic 'SE_REMOTE_SUPPORT_LURE' suggests the document may attempt to trick users into installing remote support tools, though no specific script was found to confirm this. The ML classifier strongly indicates maliciousness.

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 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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=shelby+high+school+basketball In PDF document text
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/2981816.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366035/normal_5f8811de217f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375521/normal_5f8d2dea0fa42.pdfIn PDF document text
    • https://digafixi.weebly.com/uploads/1/3/0/7/130776371/luzivesumu.pdfIn PDF document text
    • https://dikekivex.weebly.com/uploads/1/3/0/7/130775400/8823033.pdfIn PDF document text
    • https://rebivawofud.weebly.com/uploads/1/3/4/3/134375894/geberonuxug.pdfIn PDF document text
    • https://xexovelez.weebly.com/uploads/1/3/0/8/130813416/5ea52a53be3cd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bidivo/service_desk_analyst_technical_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/64449457440.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/jubufinu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/3322/9990/files/zedew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/719bcabb-f31c-4c96-abb5-2f1eb71c38a0/zuzoluderifos.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/bauknecht_mw_49_sl_bedienungsanleitung.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/6480/9373/files/st_louis_county_assessor_st._louis_mo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbb10da7-cd56-41f7-804f-e88e32d4eb44/xagonodakegitewix.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/81121873135.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/1185/0407/files/genapewejegofotevepafofu.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_off00006a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A7F 5372 bytes
SHA-256: 149799884c69b91bcd7ce37c063f4811896d3ef20f70fdcb9b44142fa7f6862f
font_01_sfnt_off00007cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CD4 10616 bytes
SHA-256: 9a19519d5246efe47d5ccbff549094f4a3376345ef6e23066402433e1e813c8b

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