Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff5b316d5d9a75e…

MALICIOUS

PDF

57.3 KB Created: 2020-11-29 01:46:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 662ed00de2d3b5a5ab7d12b2f63bf703 SHA-1: d843a05c2c6eb4e04c7ccf3eb775647e38beeeb3 SHA-256: 9ff5b316d5d9a75efd2a37165595bcbafe7da452feb46e11151e6a30bc9b253d
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, specifically the repeated use of invisible links designed to lure the user to a known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly support this assessment. The primary IOC is the malicious URL used for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Invisible/repeated PDF links deliver payload file critical PDF_REPEATED_PAYLOAD_LINK_LURE
    PDF uses invisible link annotations and points to a direct payload download. Repeated invisible links or lure-like payload names such as document/unlock/verify archives match malware-delivery PDF carriers where the page is only a prompt and the real payload is fetched from the linked URL.
  • 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.
  • 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?utm_term=4+wheel+drive+hardware.com In PDF document text
    • https://cdn-cms.f-static.net/uploads/4416672/normal_5f94bf1421b1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377101/normal_5fa8a3c35b252.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/xujitezu/81180525050.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/construction_lien_release_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/bpsc_answer_key_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/fugozetijavugenabogu.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/woodlife_coppercoat_green_wood_preservative.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/adobe_flash_player_activex_installer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d054499-a6e0-4a34-bf1c-5f3c555bea28/paises_hispanohablantes_mapa_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0a0dc04-582a-4302-ad73-8bb14f423134/64002076091.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/16750643453.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_off0000a9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9E4 5180 bytes
SHA-256: 86dedf6282a01b8088831bb4db7fd6f1cafb02f8219df433b981aea55473ebe0
font_01_sfnt_off0000bb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6D 8576 bytes
SHA-256: 5ca93eb27fc56593e573a1c6681d5751305c1fdd88d2cd0fc3466a3ee8fdf873

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