Malicious PDF — malware analysis report

Static analysis result for SHA-256 484b51f9ca7a598c…

MALICIOUS

PDF

69.0 KB Created: 2020-12-19 05:42:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 08df730fa6b5c2177949cc6085cf1f69 SHA-1: 7ccdc9308b772e6f36cf9a8e560fc79a1c151f81 SHA-256: 484b51f9ca7a598cfa2b5b6603a9222f510d7c8725d65a0dda9dfc65193cf784
222 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded links, many of which point to redirector infrastructure, including the primary IOC 'https://cctraff.ru/strik?utm_term=code.org+lesson+15+answers'. The 'SE_INVOICE_LURE' heuristic suggests the document's content is designed to trick users into clicking these links, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=code.org+lesson+15+answers In PDF document text
    • https://numuzobiw.weebly.com/uploads/1/3/4/5/134589566/2425418.pdfIn PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/853282.pdfIn PDF document text
    • https://meronikam.weebly.com/uploads/1/3/4/7/134705372/tekojazotini_pinevoxewarujib.pdfIn PDF document text
    • https://ranaxeli.weebly.com/uploads/1/3/4/4/134478161/8a7bf.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/lomuper/kexerunitepediju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1e72851-51bd-463e-9467-ed3f0adb451b/zoom_h2n_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/92883254479.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaf651ae-5679-4610-9b42-5294abd49b1e/28204414147.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/pokafevomarolisero.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/online_bus_ticket_booking_system_project_report.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/akon_dj_mix_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/302675e8-fefc-46ed-bd23-b418a7e26be9/wedding_cake_artisan_crossword_clue.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/jeluropejusavowilogurot.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/past_simple_vs_past_continuous_exercises_intermediate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/116ff5d3-afa9-4537-baef-72c10c9badef/63131519041.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b9bcd38-c7c3-45ed-bdf7-f71dd084bc5b/kokoro_download.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_off0000d16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16C 5196 bytes
SHA-256: 386c3d8bf04bc28773979f9e564523b16892026eb95c4658f17bfbd8cecd1c8c
font_01_sfnt_off0000e33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33F 10460 bytes
SHA-256: 490989ee75656eb3bf3e0377cf237d2c126818fad0a304a488e0e83523049d29

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