Malicious PDF — malware analysis report

Static analysis result for SHA-256 62d32853a841ec56…

MALICIOUS

PDF

40.4 KB Created: 2020-10-29 20:40:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b0ca725736f87525b20bb4a7c0dcb635 SHA-1: c92e0310bffbcea599a63b102f88ed265aedfd10 SHA-256: 62d32853a841ec561eef98523e8e385f3428a2e902502d23af09dcc068329004
94 Risk Score

Malware Insights

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

The PDF contains an embedded link that directs to a known malicious redirector. The document body, though heavily obfuscated, appears to contain text related to educational worksheets, suggesting a lure to disguise the malicious link. The ML classifier also strongly indicated maliciousness.

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/123?keyword=math+skills+transparency+worksheet+11+order+of+operations+answers In PDF document text
    • https://daputonekamipit.weebly.com/uploads/1/3/0/7/130775603/mijinu-jaxaxepovabofof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372080/normal_5f896bf3ed553.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383321/normal_5f930d6e08c5b.pdfIn PDF document text
    • https://worozimovazez.weebly.com/uploads/1/3/1/4/131406108/839319.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379032/normal_5f8f970b4ad85.pdfIn PDF document text
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/vusoligifolad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365634/normal_5f8708e1c16f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370285/normal_5f8c024eb6807.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/felasorarabipis/radiological_anatomy_of_upper_limb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa5140e7-ca1e-425b-9167-d41e9360bd15/wofesalininerakafujawi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbc9ae31-b2c8-44a3-90a3-d5b240a17a71/64111889935.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/21718099936.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/fefetutadovexunatewofovu.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/oracle_company_vision_and_mission_statement.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/como_leer_planos_arquitectonicos.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_off00005e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E75 5556 bytes
SHA-256: 3babff8b7e60de94c6541db7efd4f7f155912e2017c95191693512d8abd57bd2
font_01_sfnt_off0000717d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x717D 10404 bytes
SHA-256: 79229b823c233412533f0f664b1e9f26107e6a196aca98e396f1a6c9024696dc

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