Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f635b943382f27…

MALICIOUS

PDF

42.5 KB Created: 2020-11-04 17:39:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5cfd111d46b74b73d6b8570e05d50d70 SHA-1: 042674c992b8faebb05a78f069fd91a01fb64c53 SHA-256: 13f635b943382f2769ad124354148312b08631b4699af33566d9f0e918c41af9
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link to a known malicious redirector infrastructure, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, includes the same malicious URL. This indicates a phishing or redirection attempt, likely to deliver a further payload or lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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://cctraff.ru/strik?keyword=true+living+organics+the+rev+free+pdf In PDF document text
    • https://rawixokuboja.weebly.com/uploads/1/3/4/0/134097397/dc90fd4a18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367960/normal_5f88f249b5315.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379473/normal_5f9097b4139db.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/59d826f6-7b7a-45ef-b4b7-e53ddb41b002/70181113826.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/tufugibibuwuvezebovanupo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed6ae016-6a6d-4e03-b176-e0406de4faa3/32819189343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06083203-736c-4e91-bab8-0d224b8fd195/79761863802.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/595335be-00ce-4332-9d75-3a730231f7ae/la_fitness_stoneham_class_schedule.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/42266194387.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35dc6ba9-7dcd-4d38-86f7-e3877794db5a/17475257692.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/51375199932.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1f3761d-f9f0-434d-b5f4-9b98468906a7/30892699872.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37af85d1-4248-43ee-b977-956d5ddd9583/deltascape_guide_ffxiv.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D82 5424 bytes
SHA-256: 818cdf34582f435160e8f2b0993a7a5a8a7d835abdd95a848306878b6152776b
font_01_sfnt_off00005ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF6 9872 bytes
SHA-256: c59dba83209b928bb6ac53e4d19f82ce7015d581cbb147ecee21f433316fb8e6
font_02_sfnt_off000081ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81EF 17820 bytes
SHA-256: 4dcf49e65fbe3b0157df5dcd210523804a272759f1b29cd8b4c0e691f703bb1b

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