Malicious PDF — malware analysis report

Static analysis result for SHA-256 62f592a5bbef3b5e…

MALICIOUS

PDF

42.2 KB Created: 2020-11-02 05:40:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4ebef28eaa57c448ee588d61f9ae58eb SHA-1: d949ab4fa1f5786ee7bc5aada875561fe8dfac98 SHA-256: 62f592a5bbef3b5eadd9e93c00633e7e470e730c927e18d992456a9c2af30e84
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 a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to 'ggtraff.ru'. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a large number of external PDF links, including one to a Shopify domain. The ML classifier strongly flagged this PDF as malicious. The document body contains obfuscated text and the malicious URL, suggesting an attempt to redirect users to potentially harmful content.

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/strik?keyword=king+street+primary In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383132/normal_5f927e077a54a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417129/normal_5f98d72994283.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418184/normal_5f9a3611d7cb9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2256/3520/files/the_lion_king_2019_full_movie_123movies_hd.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2620/0734/files/color_english_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/dieta_cetogenica_30_dias_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/technical_interview_questions_on_dbms.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6113/2962/files/jofov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7628/1032/files/66795856838.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/sofino.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5450/9465/files/37980105602.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5921 4856 bytes
SHA-256: f5964112d9129d06e8cfc20e23a6fba20fd35ee6d07c75fd00c94a123a5ec6ca
font_01_sfnt_off00006985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6985 10860 bytes
SHA-256: d22f3ee5bec242046358de408b18f953ff03f699ed5c68138dbde4745629b271
font_02_sfnt_off00008e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E5E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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