Malicious PDF — malware analysis report

Static analysis result for SHA-256 e97fa66da0c41169…

MALICIOUS

PDF

43.8 KB Created: 2020-10-28 01:47:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2916925d387298156ace5e7c69369fac SHA-1: e80ab0aa683e36bef038893f6ce0e92fcc9d43f0 SHA-256: e97fa66da0c411695c8d93e885844686d8c2d1a3f260592c7e4f5cd8f289339b
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous links, including one pointing to a known malicious redirector. The ML classifier also flagged this PDF as malicious. The embedded document body text, though heavily obfuscated, contains a URL that is also present in the heuristics, suggesting a deliberate attempt to redirect users to potentially harmful content under the guise of educational material.

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://gettraff.ru/strik?keyword=high+school+chemistry+worksheets+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389370/normal_5f98aef675bfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_5f8e6d7eb29a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375885/normal_5f90a1a851861.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393626/normal_5f92ae9beca3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5f86fe7e8d9f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387713/normal_5f9274438a60c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369763/normal_5f94fdfbf192c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402481/normal_5f92af9c22cff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366622/normal_5f8bdc38d2cec.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/7210/2822/files/item_analysis_deped.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/1296/3482/files/zomavafidu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77e7b9b4-b1c3-4d0a-8138-02ef1acf7dda/84187485096.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/217a9e34-a4fb-4681-a31e-79f1b99ffe1f/sowodej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9488619d-131e-4f51-bbed-527cff40e865/76757502341.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78e3dbd0-0bcc-4278-aa80-c0f0a51d82af/97042899450.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0308/3928/files/45190408001.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2412/1495/files/87462103941.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/2294/2871/files/zakuzodutagunibonej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7751/0333/files/download_game_legendary_heroes_apk_mod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/2873/3862/files/ziratenaxubajezujejar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/4114/7038/files/fapofesot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7266/8319/files/95038614231.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/4533/1359/files/penanonusidonizeporuwaj.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_off00006d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D80 5576 bytes
SHA-256: c476d0c3eee4afba328bbc2c79cb15b43dfbb0f4c871a6c71ca3683a1a3fc685
font_01_sfnt_off00008068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8068 9688 bytes
SHA-256: 03708f81ceb3e6ffe2b4bd97ce89c548633264c6e3609ea274ed7bfd76a61acc

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