Malicious PDF — malware analysis report

Static analysis result for SHA-256 b712754599ee6659…

MALICIOUS

PDF

47.4 KB Created: 2020-11-02 19:53:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 99ec63d9602b8d26f1df3b64837ea138 SHA-1: dc614aafa13ab5eeb63869f0c83273f355be1bb7 SHA-256: b712754599ee6659f7990f809041d90e6aa7694c657ab0df73703afe9cdbf58d
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search results or direct users to malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score strongly suggest malicious intent.

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://ggtraff.ru/aws?keyword=windows+command+line+check+port In PDF document text
    • https://gogebuzavoriro.weebly.com/uploads/1/3/2/6/132681212/kulurexaz_ridanif_siwokerog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372702/normal_5f8e0393c0430.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387219/normal_5f917bb96637e.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/fovezewi/proximal_biceps_tendonitis_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed4bd940-62ea-48cb-b175-274af45fe8d1/47545143483.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/linda_colley_britons_forging_the_nation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8bc2452-870b-46fe-b8bd-1981c7ac84a1/fundamentals_of_physics_9th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3566/3775/files/bbc_presentation_of_the_icon_of_the_triumph_of_orthodoxy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a2cce10-8c6a-43b9-a3fb-0ed3199525f0/jumojesafadenezi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65ed347f-0a02-4df2-a176-666ed2992c56/fnh_slp_mk1_tactical.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75d45448-8e36-43c4-a6de-06082ed978b5/rilulas.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75FA 5480 bytes
SHA-256: f9619c8730b1a1c71b325534d4772e4caa3b83357d9baeb76909b954e649eb81
font_01_sfnt_off00008886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8886 11896 bytes
SHA-256: b4716017e82c93491a522447a621ab8bf74709c39bfaa4533b4f196588ff1d6f

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