Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eecdefd16a68c68…

MALICIOUS

PDF

46.0 KB Created: 2020-11-03 14:39:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 492ee6d6ad4f885acf21bf110f7e28d9 SHA-1: d782bdc01ac883ff85bc35b1c9fd6dcd61379067 SHA-256: 8eecdefd16a68c683386a5cdfdf6723cd02ad8a3c46b1b0eabd6667667271f70
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://ttraff.ru/123?keyword=nucleus+functions+in+plant+cell In PDF document text
    • https://folarudivol.weebly.com/uploads/1/3/1/8/131871739/larum.pdfIn PDF document text
    • https://nimediwajukijiz.weebly.com/uploads/1/3/4/5/134501673/d066e897d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369659/normal_5f8ff7319be3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416322/normal_5fa1298b88f14.pdfIn PDF document text
    • https://xonovezalewame.weebly.com/uploads/1/3/4/4/134489084/rusaziwa-zobegusede-lunudosela-leneji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/31b27318-8d4a-4402-b0cc-1ec1b7c29f18/forty_studies_that_changed_psycholog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01649c0d-b5c4-4b7a-afc6-56eb2aa45c72/valerie_lyrics_winwood.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/456c3ecc-6e48-4dc2-9562-d2ba1196839d/77439372745.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/55835105477.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be5e6be4-0455-43a0-98aa-07a212e8d5ad/jiwidisatelesago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cc254fa-6ad5-4921-a10d-fbf148c0788e/pogojinojawiluf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dbb01a0-83a8-40e5-8831-155838792d4a/fefakusorofavudexikugab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c7f96ab-e95d-4236-8bc1-bf508a25bb0e/mechanical_and_chemical_digestion.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000695c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x695C 4764 bytes
SHA-256: e75e4916b61c8a3ff00ac582f73389ef69867d377a10ea1765b0f033e70472ab
font_01_sfnt_off000079a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79A2 10404 bytes
SHA-256: 870226c741b2b19fb81af79fdf7eaa72865992fd9a7b650c9931d419d615ad18
font_02_sfnt_off00009d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D07 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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