Malicious PDF — malware analysis report

Static analysis result for SHA-256 215ceb7e2cdc260f…

MALICIOUS

PDF

60.2 KB Created: 2020-11-06 10:58:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d4407e33864b9571814735dd096f0ce8 SHA-1: d35e7dd72d5c7d7522327eb5fe674025d1b61f8a SHA-256: 215ceb7e2cdc260f22ff0106461cd9faa82a7586ac40c6ebd29cff68bde98a8b
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffmen.ru/strik?keyword=list+of+antiderivatives+of+trig+functions In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367286/normal_5f873df82c888.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366339/normal_5f895c48d33b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376850/normal_5f8a7cc0a7e79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388424/normal_5f97263805dd5.pdfIn PDF document text
    • https://dowezepuxaku.weebly.com/uploads/1/3/4/4/134463959/jefipijori.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368489/normal_5f87df428dc64.pdfIn PDF document text
    • https://towetebofipu.weebly.com/uploads/1/3/1/4/131437669/3b246.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381964/normal_5f8da562330ad.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/8e2c241b-7101-4184-927f-4b7676ab124e/captain_rex_helmet_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/601f08cc-87a9-49d4-a3cd-a79f9d6e900c/lafourche_parish_jobs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c082be82-dd74-48a9-b22a-6385311b5888/86628480879.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a7c00ba-77a1-4c7d-af2d-ec655b6a538c/dizojipatavunivi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/925fb5b6-3158-4e93-a5a3-af90dd26fafd/55341215792.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_off000093f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93F6 5160 bytes
SHA-256: b3300c9a3be5c12eea885bfefeee7e031cbb5c29f6aec9894ffbaadfdaaef2bd
font_01_sfnt_off0000a5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5A2 12408 bytes
SHA-256: 53c3a5fb843be42e5dbc8edcf735d37c4cac2cbc0a3c475346cb9def8a737e1b
font_02_sfnt_off0000cdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF6 16344 bytes
SHA-256: 0831afe392f92d411a34926e1a0c83e057a1e5e699ce9c22bbf98b99aa34c945

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