Malicious PDF — malware analysis report

Static analysis result for SHA-256 4068c52bd7084839…

MALICIOUS

PDF

44.9 KB Created: 2020-10-30 14:42:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 88ee9fb9dbeab840358c5dccf8ec6548 SHA-1: 8a6800bde3bf406a015801006959bee55a75a281 SHA-256: 4068c52bd70848397cf1d5f90024cb48e00069f33f85abf1f4b7fcc233b5740e
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 identifying it as a malicious redirector. The primary malicious URL, 'https://gettraff.ru/strik?keyword=dungeon+defenders+2+apk', is designed to redirect users. The document body, though heavily obfuscated, contains references to this malicious URL and other benign-looking PDF links, suggesting a deceptive lure. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence indicate malicious intent.

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://gettraff.ru/strik?keyword=dungeon+defenders+2+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372399/normal_5f903c8c16fe7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366376/normal_5f87267455b4d.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/30eb7327-ff6d-4484-8a5b-276ea6382c02/15977462038.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/1850/0276/files/submandibular_triangle_pain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f3478a2-3ffd-4b87-b22e-c5fce3158124/rio_rancho_high_school_demographics.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/dabugivugivemejomib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/9164/9199/files/pokolagodopos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15a9b4db-95b6-49e6-9291-005e1bcd57cb/wuxavakal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/022c36d6-a9b1-4a90-8baf-364e66b4c820/32169133879.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5ec30bc-6996-40ff-aa5e-d5eb826020a6/sejoma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98a4fc0c-f049-4e1b-a6b7-5cecdcaf4f19/25985254429.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_off000068a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68A6 5372 bytes
SHA-256: 79dc935cadb672e4d19c0c47540ff894ac7e616f9f896003363fdb87c292ac6a
font_01_sfnt_off00007b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B0C 13572 bytes
SHA-256: 8e66ce99402aa6c09d71101387fefeb1192473efdef1587ceba48e57ab6585ff

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