Malicious PDF — malware analysis report

Static analysis result for SHA-256 f64c36e5889077e6…

MALICIOUS

PDF

44.3 KB Created: 2020-10-06 11:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8a1a47b6d4f9268e5dcc38b77a4785ce SHA-1: 79bce84c92e3c941d49a4e581a994a8b3cfd39a0 SHA-256: f64c36e5889077e64b20b69d5dfbd9d71f5b2c711a0afae8c5590e6e659d6f8b
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, disguised as a Minecraft launcher download. The ML classifier strongly flagged this PDF as malicious. The embedded URL, https://cctraff.ru/strik?keyword=minecraft+launcher+mediaf%25C4%25B1re++1.+10, is the primary indicator of malicious intent, likely leading to a further stage of infection.

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://cctraff.ru/strik?keyword=minecraft+launcher+mediaf%25C4%25B1re++1.+10 In PDF document text
    • http://files.westlakechoirs.org/uploads/1/3/1/4/131407183/runazotifivopa_gosezutidub_wulusem.pdfIn PDF document text
    • http://files.j2theson.com/uploads/1/3/1/4/131407315/e3ec002ad561.pdfIn PDF document text
    • http://files.jennibrennan.com/uploads/1/3/2/8/132814990/demuw.pdfIn PDF document text
    • http://ribip.p-l-a-i-d.net/uploads/1/3/0/8/130814411/6675424.pdfIn PDF document text
    • http://pasoni.nutterscrossingcommunityhoa.com/uploads/1/3/1/8/131857114/nuzisojujebupulaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a98d404-df56-4772-8f8f-bd3a085b290f/bilajotafuwor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7650c12-577d-4a40-9150-68b3fbac75cd/juleduwuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aee473d-4f22-454f-9147-6543530f80fc/59387941289.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6e57edc-ce10-4f7f-be59-5c06898e63ff/pebaxutuseli.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9504/6824/files/moment_of_inertia_of_a_wheel_with_8_spokes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5663/5816/files/16192131336.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3963/2807/files/nafofodotemiwatujo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2703/8369/files/daves_peach_pie_moonshine_recipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f40957bb-67da-485d-87c2-245ebd8e44d8/bidulovaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43545a22-dcfd-4ede-9398-9ea5b1a09e88/31776134112.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15513fdb-cb7b-426b-b6ba-6e383b07961e/xoxekuda.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_off00006d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D19 5348 bytes
SHA-256: 738b702e689bf04ea15ac9773748b00f8aad03988b11a05f700447bf7ec6f5ad
font_01_sfnt_off00007f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F2E 10340 bytes
SHA-256: 92952bc28a9d70d5357f9f909bc6dce65ff5192693aac34d4333e6e31dc3de59

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