Malicious PDF — malware analysis report

Static analysis result for SHA-256 5274047bbc03930f…

MALICIOUS

PDF

45.3 KB Created: 2020-11-05 20:54:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 57772bd50a7316360d3eaf73674b770c SHA-1: d25ccc00aca25a4afb493cd7808df18e0ebc1fb5 SHA-256: 5274047bbc03930f18a92927370960547193d28bff47d67e772421fb8f5a6f1b
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a fake CAPTCHA lure, designed to trick users into interacting with malicious links. It links to a redirector and a large number of other PDFs, suggesting a link farm or SEO poisoning campaign. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs further supports this.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://ggtraff.ru/123?keyword=words+with+ei+long+a+sound In PDF document text
    • https://kofudavobew.weebly.com/uploads/1/3/4/6/134602163/vosuwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378620/normal_5f98b290e9b34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391921/normal_5f969b359d180.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391623/normal_5f9f7a8f77782.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367656/normal_5f92b6d3b6fd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_5f8840246ba3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419198/normal_5f96636218bec.pdfIn PDF document text
    • https://dekekutema.weebly.com/uploads/1/3/4/4/134440935/selogiwabevevi-betupu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421764/normal_5fa208ac833d4.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/retisovojor/crud_matrix_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/nujosuwemedadi/manual_pizza_dough_press_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10aff888-5c18-498b-80c4-a14a74d9c1d2/mujuredosamaj.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/cmore_red_dot_cover.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bf95028-9c53-47fa-bea1-a427c2c9886e/30234898321.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000711d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x711D 5192 bytes
SHA-256: 944500f53e6241937480a2f9f25b8ee338e51b3969e157ef6045cc522b983266
font_01_sfnt_off000082d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82D7 11968 bytes
SHA-256: 8e0c003298eb041f0d624c2d18eb5551ad13eb073d37abd3d4f53c66c81e999a

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