Malicious PDF — malware analysis report

Static analysis result for SHA-256 45276d3e6ec8aeb6…

MALICIOUS

PDF

47.9 KB Created: 2020-10-17 12:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a227cafaa29992c2055372bdc1647350 SHA-1: 89b6b366f9e0f12b41d33ff066d189432716b15e SHA-256: 45276d3e6ec8aeb647afc25a694b52eae7dae379b8d2286fe1b0edb876624e85
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a significant number of embedded links, with many pointing to external PDF files hosted on disposable domains. One critical heuristic indicates a link to known malicious redirector infrastructure. The ML classifier also flagged this PDF with high confidence. The primary purpose appears to be SEO manipulation or redirecting users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://ggtraff.ru/123?keyword=intermediate+news+writing+and+reporting+pdf In PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/vovariwogebaxegi.pdfIn PDF document text
    • https://bewupoterefi.weebly.com/uploads/1/3/1/3/131380107/detox.pdfIn PDF document text
    • https://fekudumubaf.weebly.com/uploads/1/3/2/6/132681201/tamuzifab.pdfIn PDF document text
    • https://jasazifo.weebly.com/uploads/1/3/1/4/131437377/fugevo-tufuwepu.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/9506eb3ef.pdfIn PDF document text
    • https://pepotoxuxomupav.weebly.com/uploads/1/3/1/4/131483830/januvimubazi_nafuziz_sogifemiditis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366949/normal_5f8a4cb340301.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378386/normal_5f8a5e63cd25d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366384/normal_5f8a1f407ee8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369323/normal_5f8a08133a526.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/be61724a-52ec-4d05-876e-1d5479fff8b3/jirekabewegarikonubagijo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd6fd0af-f3fb-4488-a700-3311235a8d62/nimelavakemawabevetebanat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca95fed8-a6fe-4323-8612-a213dd82e712/64497082216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb03f069-dbbc-4130-9ee1-56c6ce2dd599/kalevipapelaxokagamawepu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28887f59-0e7b-4b75-b7e4-98b02eff2cef/busunes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9a4a3c5-8f12-4364-bf20-2e9c34d8be6e/66032833203.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/390465e9-0304-4935-a832-c862b466b17a/debojalurifonupajimozuza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/385aff47-8f46-47f0-8c45-6aa856a5578e/39383887983.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/660a1915-8556-4060-a5d0-9ac0b4a412ee/6217519136.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6836/6760/files/total_gym_1400_owners_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/2102/0578/files/ditupodovugokemegokiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/9873/5263/files/bumbo_multi_seat_pink.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2941/2040/files/nafejopeboko.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_off00007b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B73 5356 bytes
SHA-256: 52e126fc8081a68f3b52ebdcb0bab29e716074de2e00fe5496a7cbbd5edbeb4b
font_01_sfnt_off00008da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DA1 10488 bytes
SHA-256: ca2f87a404e0d8432281473f06c54fc4c19c11dfcadf8efe7038d72fe160605c