Malicious PDF — malware analysis report

Static analysis result for SHA-256 963885507813cc58…

MALICIOUS

PDF

39.8 KB Created: 2020-10-30 22:58:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e2e8b8994d7402887b2f987e4fb851dd SHA-1: 287d1f5a0f5cd3382d59bea6b6a2e92782290000 SHA-256: 963885507813cc5816e26d5f266925957d599a4bc9c842278cedcbec2d6738b0
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://cctraff.ru/123?keyword=another+word+for+never+satisfied In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366020/normal_5f86fafc4399b.pdfIn PDF document text
    • https://vobemebu.weebly.com/uploads/1/3/4/3/134383317/bubalakewo_tulugevulub_moxujil_robatexuzukemi.pdfIn PDF document text
    • https://nizesuvijeva.weebly.com/uploads/1/3/1/6/131607023/5379944.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/henghuili-files2/bosquejos_biblicos_cristianos_para_predicar.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/pizutelot.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/juwolowibasopad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/401fa3d3-0c46-4d33-b264-97c356bbc6b1/fagogoronuwudakelosas.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/iso_37001_an_introduction_to_anti-_bribery_management_systems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9791aac9-d1f5-45d4-850a-4abfbeb14b6d/milikujudogesagobokiforu.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/bitmap_converter_to.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c560de6-6540-4dbb-8440-919823586d48/xetutitefalesuzulusuba.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000049fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49FD 5104 bytes
SHA-256: 38d6be8468e225bcf4194c1add5cf6f7a984a4e42eb18179c821ace58be52795
font_01_sfnt_off00005b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B70 9668 bytes
SHA-256: 9f3d92c9f586917562ad186d6539bdaf78aa7d8f12c37e99e2ee365f1ebca523
font_02_sfnt_off00007bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF1 16552 bytes
SHA-256: 37f9f6c2f76b18984a96bcae519d82c905410d2daa0898122d28a5a57ad83bad

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