Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a32e92c0bcb7b84…

MALICIOUS

PDF

39.2 KB Created: 2020-10-10 18:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ec58a4d058174ec886dc6ba9f5f69d0e SHA-1: a6e414a65a019240c6ebfb34d725f5c1474c88f4 SHA-256: 8a32e92c0bcb7b84d78d3e01a4b97ce90d660f8520f58bd518c68519a2542bff
124 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains a reference to the malicious URL. The ML classifier also flagged this PDF with high confidence. The presence of numerous links on disposable hosting suggests a link farm designed to obscure the ultimate destination, likely for phishing or malware delivery.

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/pify?keyword=economics+rules+rodrik In PDF document text
    • https://site-1039210.mozfiles.com/files/1039210/90379923097.pdfIn PDF document text
    • https://site-1040798.mozfiles.com/files/1040798/2991384746.pdfIn PDF document text
    • https://site-1043451.mozfiles.com/files/1043451/8457536773.pdfIn PDF document text
    • https://site-1039496.mozfiles.com/files/1039496/dijotefepixawinovunusizo.pdfIn PDF document text
    • https://site-1038649.mozfiles.com/files/1038649/50371573180.pdfIn PDF document text
    • http://files.sewingclassmiami.com/uploads/1/3/1/4/131453526/bujulenapupun.pdfIn PDF document text
    • http://mirafar.hgltours.com/uploads/1/3/0/7/130739090/rosaranemip.pdfIn PDF document text
    • http://fidogew.kim-cuomo.com/uploads/1/3/1/8/131857112/9498059.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/7250c07d-1956-4221-ac98-be2916e68640/divanijojibufaxijizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dd62370-a8f2-4092-8656-58e2de195a67/jidofiseg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30863f43-697c-4fc6-acb3-7e59431f1d1c/21620799519.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6229032-1eff-4412-bca0-89676c037862/favosunerujegavejof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5394/6782/files/jokunapar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8950/9017/files/36860478097.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_off00005ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC4 4896 bytes
SHA-256: eba9c93ec13e6e1ee44b9384e2dc81ba5750f820c03be59c004e171889fa12d3
font_01_sfnt_off00006b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B4A 11708 bytes
SHA-256: 98b318f65409a027c4faf19931ea87e86b5862c4a8afec4e4ac7f0d9e7072f20

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