Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3eb19567fef3893…

MALICIOUS

PDF

38.2 KB Created: 2020-10-31 14:51:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f48923c38876a4eeea0bc271010da8e4 SHA-1: 774704c550db24bcb3f81cd20e1e4ebd2fb15d35 SHA-256: b3eb19567fef3893f6c61d43c1933619700ed754048f52a9a46411c1ddb44c81
94 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to lure the user to a malicious site, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/123?keyword=broken+sound+country+club+map
    • https://cdn-cms.f-static.net/uploads/4373008/normal_5f93250a5dae7.pdf
    • https://cdn-cms.f-static.net/uploads/4392664/normal_5f956f71469dc.pdf
    • https://cdn-cms.f-static.net/uploads/4369187/normal_5f98396b95225.pdf
    • https://cdn-cms.f-static.net/uploads/4375076/normal_5f998e4f2c8f0.pdf
    • https://fulipevaxavu.weebly.com/uploads/1/3/2/6/132695351/napofujewub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mulerux/raspberry_falls_golf_trail.pdf
    • https://cdn.shopify.com/s/files/1/0503/5465/1294/files/super_mario_world_cheat_codes_emulator.pdf
    • https://cdn.shopify.com/s/files/1/0431/0063/5290/files/lugupuma.pdf
    • https://s3.amazonaws.com/liguwubore/2351378398.pdf
    • https://cdn.shopify.com/s/files/1/0428/5952/8355/files/bubble_shooter_android_apk_download.pdf
    • https://s3.amazonaws.com/dukexajuj/zogibakabezi.pdf
    • https://s3.amazonaws.com/zirojopemup/4025307164.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_off000054b1.bin
3b79e8baf9f829795027d0ed7cb0352c2ffa866e49d27dae6a30ade3592adb80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54B1 5572 bytes
font_01_sfnt_off00006793.bin
a7d510eb49a7df4cea632ea2d42ff65b01a3c88917bbb6b3007c2105d3c288dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6793 11112 bytes

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