Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c926f9eecaf1cb2…

MALICIOUS

PDF

60.5 KB Created: 2020-10-29 11:31:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f29529e904a45b78e83913dd42109fc SHA-1: 9fd370d43577220f79b4bc3b471f6f7a96417dc0 SHA-256: 5c926f9eecaf1cb21bc9d9bc4d09848da79b0381a499d564084010daefd20850
194 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ggtraff.ru, which is a strong indicator of malicious intent. The document body, though heavily obfuscated, contains the URL and appears to be a lure related to a book title. The presence of numerous external PDF links, many hosted on platforms like strikinglycdn.com and s3.amazonaws.com, suggests a link farm or SEO manipulation tactic to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=el+libro+de+los+sue%25C3%25B1os
    • https://cdn-cms.f-static.net/uploads/4393779/normal_5f8fe8be426f8.pdf
    • https://cdn-cms.f-static.net/uploads/4370304/normal_5f910be1413db.pdf
    • https://rokozozo.weebly.com/uploads/1/3/4/4/134498035/motodo.pdf
    • https://wonigebegi.weebly.com/uploads/1/3/1/6/131606731/54c86654.pdf
    • https://cdn-cms.f-static.net/uploads/4368478/normal_5f8be61fa3f2f.pdf
    • https://tevirilozarenov.weebly.com/uploads/1/3/2/6/132695732/5189618.pdf
    • https://medizagokitoni.weebly.com/uploads/1/3/2/3/132303310/2613559.pdf
    • https://cdn-cms.f-static.net/uploads/4387229/normal_5f962f3328b91.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/781b61ad-5cde-4592-83b9-66e5f6d8e622/59882570081.pdf
    • https://uploads.strikinglycdn.com/files/c7ecce66-3a08-42bb-a70b-d407dd6aed43/pelavosorupozaxofaxe.pdf
    • https://s3.amazonaws.com/dazifozixawus/abraham_family_tree_to_moses.pdf
    • https://s3.amazonaws.com/fasanag/the_catholic_bible.pdf
    • https://uploads.strikinglycdn.com/files/b0f5d8af-2ec6-4bd3-a70b-292aa75d5180/intermediate_classical_piano_sheet_music.pdf
    • https://uploads.strikinglycdn.com/files/c12f17f3-8992-4758-98c4-f2c72e97e745/vobowuzoliwodevixof.pdf
    • https://uploads.strikinglycdn.com/files/04c19116-da32-48e3-a8f1-8946fc831bf1/damilewujimokipep.pdf
    • https://s3.amazonaws.com/zetare/cameroonian_dishes_recipes.pdf
    • https://s3.amazonaws.com/zurovajij/42647291664.pdf
    • https://uploads.strikinglycdn.com/files/16f8d950-3248-4c20-aa0e-813b7cd10885/48138506307.pdf
    • https://s3.amazonaws.com/fezenur/2.07_energy_conversions_worksheet_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/97230a3c-265f-4ee7-9158-3368ec061c72/miwodumomenukapijapezi.pdf
    • https://s3.amazonaws.com/wewuxuviwar/bacterias_gram_negativos.pdf
    • https://uploads.strikinglycdn.com/files/51df768a-2ac4-4b1a-8fc7-baa955bcd843/mekiwujupupokelefabas.pdf
    • https://s3.amazonaws.com/defujo/shri_bhagwat_gita_in_hindi.pdf
    • https://uploads.strikinglycdn.com/files/7de003a8-e22c-4b61-bba6-2a0588948960/pomogem.pdf
    • https://s3.amazonaws.com/bopuxosavubare/15688730031.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a97d.bin
0ea784df5dcd13d6ddd0b7106db5ba6488dace5f89af0abb7df73c52362c7718		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA97D 4920 bytes
font_01_sfnt_off0000b9fe.bin
6c35a9379d8a6877928bef50144e75d902a0bbf3650cb4f6f65ec20c393bde60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9FE 12856 bytes

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