Malicious PDF — malware analysis report

Static analysis result for SHA-256 da94b702baa0d7b7…

MALICIOUS

PDF

43.4 KB Created: 2020-08-15 11:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e71ddb6c20423c54bc9ffe235e2456ba SHA-1: 279aee0a0d09be494452a1d5d2c8f71cccb78862 SHA-256: da94b702baa0d7b7c50ba32f21942738a7560715d7e29064a0701f65be2e69ee
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://ttraff.ru/wb?keyword=bourse%20maroc%202019%20pdf'. Another critical heuristic identifies this as a PDF SEO link farm, with 19 generated SEO PDF links, predominantly hosted on cdn.shopify.com. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users to malicious sites through these embedded links.

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://ttraff.ru/wb?keyword=bourse%20maroc%202019%20pdf
    • http://kizerezo.deltamoonsoap.com/uploads/1/3/2/6/132695471/duwuzew-vewusev.pdf
    • http://files.napervillenorthgirlstrack.org/uploads/1/3/1/6/131606819/diwurukexer.pdf
    • http://palapete.minimaestrosmusic.com/uploads/1/3/0/7/130739964/novuziwusabemov-fuzujarod-kugivalo-pavadofudarodu.pdf
    • http://regaliju.ironsharpeningoursisters.com/uploads/1/3/1/3/131398140/240247dd9.pdf
    • https://cdn.shopify.com/s/files/1/0433/7192/1571/files/rolilubetekuwuzovoxukiw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/37741658126.pdf
    • https://cdn.shopify.com/s/files/1/0435/3956/2645/files/rogukewosesit.pdf
    • https://cdn.shopify.com/s/files/1/0434/6730/9206/files/44420829170.pdf
    • https://cdn.shopify.com/s/files/1/0431/9602/2933/files/78988531608.pdf
    • https://cdn.shopify.com/s/files/1/0438/9522/6523/files/calus_mini_tool.pdf
    • https://cdn.shopify.com/s/files/1/0432/9403/2025/files/participatory_action_research_methodology.pdf
    • https://cdn.shopify.com/s/files/1/0428/5172/9564/files/vebitodusiribojuxog.pdf
    • https://cdn.shopify.com/s/files/1/0439/8442/1022/files/23868127528.pdf
    • https://cdn.shopify.com/s/files/1/0437/0753/1414/files/bumebaliwab.pdf
    • https://cdn.shopify.com/s/files/1/0431/5850/3590/files/lifupivuwoxanepapa.pdf
    • https://cdn.shopify.com/s/files/1/0435/6397/4805/files/edexcel_a_level_biology_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0429/3538/6265/files/list_of_common_medical_abbreviations_and_terminology.pdf
    • https://cdn.shopify.com/s/files/1/0431/3487/7847/files/talanizaxewabevokoji.pdf
    • https://cdn.shopify.com/s/files/1/0431/9982/4032/files/zalidobuwezok.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064d1.bin
f4be329a004b7405b8c8aee5b4b193184fbf4022cf21fb8c51da6152efcde921		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64D1 5800 bytes
font_01_sfnt_off00007879.bin
701ce8e2292ec34a97fe4a207e18ca05009da0f51ab7f5168f4b6e21e46a16ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7879 12288 bytes

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