Malicious PDF — malware analysis report

Static analysis result for SHA-256 38bfffb0be06662e…

MALICIOUS

PDF

62.4 KB Created: 2020-10-01 02:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fc785cc07a16b238f1ea6557cd9f13a3 SHA-1: 18243d4a3a56f31d5932f3b5dd367ba62e19eabf SHA-256: 38bfffb0be06662e2a0c68d13bed311848cd73b93134f9627164f10ddf4264d5
124 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to malicious infrastructure, specifically a link farm designed to drive traffic to potentially harmful content. The document body, though heavily obfuscated, contains a URL that matches the heuristic firing for a malicious redirector. The presence of multiple links on disposable hosting further supports the 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=ielts+writing+task+2+general+samples+pdf In PDF document text
    • http://raxavuxar.carrowmore.us/uploads/1/3/1/4/131406688/zewag_galujirevimezi_mesofobop_wolukele.pdfIn PDF document text
    • http://pawuwez.cantonohiolandscaping.com/uploads/1/3/0/7/130776321/3998718.pdfIn PDF document text
    • http://files.kevinanglade.com/uploads/1/3/1/8/131856146/789a427fd16b97.pdfIn PDF document text
    • http://files.housespechomeinspections.com/uploads/1/3/0/7/130775867/4908446.pdfIn PDF document text
    • http://zibava.susieastwestcenter.com/uploads/1/3/1/4/131483222/teloru_wolud_mamuvom_gewiril.pdfIn PDF document text
    • http://borumap.viana-motion.com/uploads/1/3/2/6/132683138/livupurikub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0610/6528/files/what_is_neural_network_in_machine_learning.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6085/3912/files/lajoxizedegaxosivaneneva.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5168/7848/files/peketuwawiradawe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f83b7c5d-7686-47e8-bd2a-a3ec4cb32ad0/1946241702.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c44324b8-9125-48e9-ab3e-c24d8ee1ec79/wuruzezevagololazub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8212a9dc-f183-4881-ac6a-5407beacfaf9/56773036067.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b91c9793-87f2-4e4d-b785-9869473d139a/naximu.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_off0000af77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF77 5588 bytes
SHA-256: f2914a948891dfdaa2ffe7e33e72561f6f2f7b08a6c293992220e9ba52abd362
font_01_sfnt_off0000c275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC275 13340 bytes
SHA-256: 429c57a73fcc658b782899a5fa5410c7a1cf582ce91f5b37c45d474bc60daf27

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