Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca83aef74ca8038…

MALICIOUS

PDF

41.8 KB Created: 2020-11-02 06:22:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: fa3191c631c469d9380b0d23ee58d105 SHA-1: 0d33e617d2e2cc609ad23d3be5a0bb86baa87496 SHA-256: 9ca83aef74ca80386415435f3f5fc025a8eb3a31ac1c6c842d0a74cea79f882b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to a redirector infrastructure designed to lead users to malicious sites. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly indicate this malicious intent. The ML classifier also flagged this PDF with high confidence. The document body itself appears to be obfuscated or corrupted, but the presence of the URL 'https://cctraff.ru/123?keyword=contour+glucose+meter+manual' within the document text further supports the malicious redirection attempt.

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.
  • 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.
  • 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/123?keyword=contour+glucose+meter+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388820/normal_5f8dff1c46289.pdfIn PDF document text
    • https://fenagedel.weebly.com/uploads/1/3/4/3/134316540/mubixeki_zatab_delonoviw_kulipuborono.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387699/normal_5f90ad82285d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369305/normal_5f8c88d95a830.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/fenixaxitimitomowub.pdfIn PDF document text
    • https://tetikofigutuda.weebly.com/uploads/1/3/4/4/134445118/8544069.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408589/normal_5f9729e163d65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384144/normal_5f9908da9cb98.pdfIn PDF document text
    • https://walijogopabo.weebly.com/uploads/1/3/0/7/130776167/da942785a349.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/jamokaroxoj/buzikodopekado.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/kobalt_miter_saw_7_1_4.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/livro_clculo_e_administrao_de_medicamentos_na_enfermagem.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/66453961229.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/if_formula_in_excel_2010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71181473-08ef-45de-bfdf-b1afeb4d28f9/wapoz.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_off00006522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6522 5024 bytes
SHA-256: e9629983adcc2f8ef25df0cf017be44652ad21b94843e45b7e1cf1236bc92d6e
font_01_sfnt_off00007620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7620 11164 bytes
SHA-256: bb81ca94b19406ef5034491b50c0ad8f21388c67dd81c86e29d547a8e56d8c79

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