Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd667fea97a60c02…

MALICIOUS

PDF

46.2 KB Created: 2020-11-01 07:56:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5c6a07663a085fc1a823739664bd5d1a SHA-1: 1b1fce75412029bdf01f25694bdebcf4b55528c3 SHA-256: bd667fea97a60c02ea3a2c67d3b7f8d37595b675b85800474e39220730889ae8
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though obfuscated, contains text related to educational worksheets, suggesting a lure to trick users into clicking the malicious link. The ML classifier also strongly flagged this PDF as malicious.

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://ttraff.link/123?keyword=practice+6-6+trapezoids+and+kites+worksheet+answers+form+g In PDF document text
    • https://cdn-cms.f-static.net/uploads/4392474/normal_5f9bea0eda98b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373508/normal_5f9325a359a39.pdfIn PDF document text
    • https://jawogebewo.weebly.com/uploads/1/3/4/3/134369376/vixamumaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6234/5384/files/polymorphism_in_biology.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/8552/7743/files/devoxopafuvafusinomip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90971815-c235-4c08-a168-e4d4f027e755/46920553340.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7691304d-b77c-43a4-bda0-fa45f2f9f436/thermodynamics_an_engineering_approach_9th_edition_slader.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e21dab7-1864-4308-afe4-21243862a9c7/933807438.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/demukavukodowininow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/4918/1080/files/how_to_draw_a_griffin_step_by_step.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5090 2900 bytes
SHA-256: 9c84aca5171cf4522e1fd23f3e5391e17c8e645cdcb740b4c3036af6865bd014
font_01_sfnt_off00005ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AD5 5928 bytes
SHA-256: f0b61b423931dddda5a92bf813df62d6a4977d868d2a78267d5e0d97d03a7f0a
font_02_sfnt_off00006f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F06 11088 bytes
SHA-256: 03db80a9ed20504b6847d5a5c6ae90eb3d94779246feec90477f2edd6499eb08
font_03_sfnt_off00009506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9506 16348 bytes
SHA-256: b7e88b3779b1b058a1ae158c06554beee3388524123d756b7f3fd6c23f04d7d4

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