Malicious PDF — malware analysis report

Static analysis result for SHA-256 36546a3dd0e75ad1…

MALICIOUS

PDF

43.0 KB Created: 2020-11-05 18:37:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5def9908cf92e67b12564e5cf9ccfe26 SHA-1: d58afc3f63cf396add829170a92964c0a81642c6 SHA-256: 36546a3dd0e75ad19cc9d88dfffe1cd3de2bdecb7faade1823a11dfcf10227a5
94 Risk Score

Malware Insights

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

The sample is a PDF document flagged as malicious by a machine learning classifier and contains a link to known malicious redirector infrastructure. The embedded URL, https://gettraff.ru/strik?keyword=the+rough+faced+girl+pdf, is the primary indicator of malicious intent. While no scripts were explicitly extracted, the PDF structure and the presence of a malicious URL suggest an attempt to lure the user to a harmful site, likely for phishing or further malware delivery.

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/strik?keyword=the+rough+faced+girl+pdf
    • https://cdn-cms.f-static.net/uploads/4379610/normal_5f9a9d0590279.pdf
    • https://cdn-cms.f-static.net/uploads/4376858/normal_5f8c58638868d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wewuxuviwar/37745611689.pdf
    • https://uploads.strikinglycdn.com/files/e145ffa6-5420-4843-b410-0dbb4b64ad05/76596130904.pdf
    • https://s3.amazonaws.com/firigugixujotov/zararuxava.pdf
    • https://s3.amazonaws.com/bawalidamovidud/quincy_junior_high_school_quincy_illinois.pdf
    • https://uploads.strikinglycdn.com/files/62c4a86a-1b74-44c9-8093-1679b9b4e6e1/cambridge_english_empower.pdf
    • https://s3.amazonaws.com/tosevud/14935676992.pdf
    • https://s3.amazonaws.com/leguvefu/toronto_attractions_map.pdf
    • https://uploads.strikinglycdn.com/files/634512de-f119-461c-9049-5fee3565d562/bujoforikumasasezokedawo.pdf
    • https://s3.amazonaws.com/tetazino/75137462999.pdf
    • https://uploads.strikinglycdn.com/files/539e0b02-cb9f-4ca6-8883-f93b97d038d0/pusakogotevusapelivajud.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_off00006a5b.bin
711859e39d4cba214c3716cce6985037184ad7c6d4e92c3fac0bef615c60809a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A5B 5188 bytes
font_01_sfnt_off00007c00.bin
f7dd90953a11fc4bf370f44b9c9e83f1b9ad65b68377fb020e6753669564e28f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C00 10396 bytes

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