Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed1b91992cb77fa…

MALICIOUS

PDF

40.0 KB Created: 2020-10-07 12:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 16ded504acdd50159ee73b9b167d91e8 SHA-1: 573826ea7503df7e1654148c0e6df2c7a690fdc4 SHA-256: 4ed1b91992cb77faa0b938b1053c98f99fea495df51627c6287411126ff4fb94
134 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_RANDOM_URL_LINK' heuristics. The document body, though heavily obfuscated, contains text suggesting a lure for a '2002 lincoln ls repair manual free'. The primary malicious URL identified is https://cctraff.ru/strik?keyword=2002+lincoln+ls+repair+manual+free, which is likely part of a phishing or malware distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not 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://cctraff.ru/strik?keyword=2002+lincoln+ls+repair+manual+free In PDF document text
    • http://files.thehighground.shop/uploads/1/3/1/0/131070883/sogiwawup-kapatufunelem-refataloduva-geguwukezo.pdfIn PDF document text
    • http://files.mrsararadian.com/uploads/1/3/1/4/131453676/725d0ad5d8b20d.pdfIn PDF document text
    • http://files.avinumalkeinumessianicsynagogue.com/uploads/1/3/1/4/131437091/rewafiluwigamozere.pdfIn PDF document text
    • https://site-1039253.mozfiles.com/files/1039253/6512026956.pdfIn PDF document text
    • https://site-1038783.mozfiles.com/files/1038783/fisifomaforikamufi.pdfIn PDF document text
    • https://site-1036754.mozfiles.com/files/1036754/57406321422.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/ce5dadb2-d6d8-453d-8fe9-b187894161dd/72381945710.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28757cbd-06bf-4a93-93aa-4ffc00c75a45/7360100803.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bcd63fa-7dae-4de9-ac69-ad4ff589f1cc/genuvuledo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3f0ab66-78f1-4765-b07e-6d1da3fd53f8/foziropiloxalanovuwirinaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb5282bd-a15e-4f72-a30d-e2c84a68b974/71965819882.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8b5d83b-0f70-42a5-8b5f-8adc823187eb/1836676197.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/663f23f7-128b-47ce-957f-23b839b4dd0f/32363879105.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_off00005dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DFA 5340 bytes
SHA-256: 7a8ece664e25f9814604aade1b8575a1b19fa257c3115ba0434b63b0ec0a7d3d
font_01_sfnt_off00007009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7009 10284 bytes
SHA-256: 7b5cab8234f572f90ee4e26a70e595ac8b662772dab0f64cd61c19dd148dc0fb

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