Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa39b36c0df85f0a…

MALICIOUS

PDF

73.2 KB Created: 2020-12-28 15:24:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ed83e284ac8ac1c5f7955cd36d03e8e6 SHA-1: e66160b34d4c4c4490bedfaaa5739147f6879777 SHA-256: fa39b36c0df85f0ad9872601d9ed8b259d1c4759163fd694aab06d9ad03e2d94
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/strik?utm_term=prop+hunt+multiplayer+free+pc'. This, combined with a high-confidence ML classification and ClamAV detection, strongly indicates malicious intent. The presence of a 'download button' heuristic further supports the lure-based attack pattern, likely designed to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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.
  • 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://cctraff.ru/strik?utm_term=prop+hunt+multiplayer+free+pc In 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://s3.amazonaws.com/voropa/steve_harvey_family_feud_dumbest_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01d9cdbb-5b55-4c13-ad91-456b6e050f41/vamasunanamagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0b3816d-36e4-4ca7-aca7-45eed044b51e/wosavupokiwejuvariwuwibod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fd861b0-a0d0-411e-8a37-8a5dde8cf1b2/kepuxiza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df5e1724-b6b8-4394-bbbe-a6eaa21ea097/wisixiserudut.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/namenutidizulupom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b284e478-1438-4fde-abaf-df4cae7b21f0/20987431940.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04b221ec-c182-498d-bad5-81b3486680b7/dell_15.6_notebook_with_windows_8.1_100_disk_usage.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/zusadab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe9dbc98-a591-4cda-b491-ceec3cbe3752/anavar_for_sale_uk.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_off0000d689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD689 5064 bytes
SHA-256: 8e7018a09bff4984c195bc88653afc955579e79b55fdb7c03f4f18a41346be14
font_01_sfnt_off0000e797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE797 10172 bytes
SHA-256: 9a0155164b34398d21153244ec3d76a27aa0603fb8fdf3f89775a88869143434
font_02_sfnt_off00010a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A41 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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