Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c527632aadd9e0…

MALICIOUS

PDF

41.6 KB Created: 2020-10-03 23:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 78cd1c0393a33df3c83bdb0b4faf6c91 SHA-1: 8d2b54c706a9f8fbacb1246d7c3654685d67830a SHA-256: e8c527632aadd9e0adaffa478ea09e6bf3a2f9a5beb10de84ed80f408eba4a46
184 Risk Score

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://gettraff.ru/strik?keyword=free+measurement+worksheets+for+3rd+grade In PDF document text
    • http://files.greenevillefarmersmarket.com/uploads/1/3/0/7/130776483/5899293.pdfIn PDF document text
    • http://siniwej.fiberhooligan.com/uploads/1/3/1/3/131381761/4489672.pdfIn PDF document text
    • http://files.everywhere2everywhere.org/uploads/1/3/1/4/131407492/fuzaxuk.pdfIn PDF document text
    • http://files.meghannrader.com/uploads/1/3/1/4/131482823/4032062.pdfIn PDF document text
    • http://gepifubi.brunnernh.com/uploads/1/3/0/7/130738893/pojegom_dijogine.pdfIn PDF document text
    • http://kizorofud.sciartmagazine.com/uploads/1/3/2/6/132682735/topuferivataji.pdfIn PDF document text
    • http://nadexonu.blatteislaw.com/uploads/1/3/1/4/131408024/5ec0f9ec06.pdfIn PDF document text
    • https://site-1038990.mozfiles.com/files/1038990/45799433287.pdfIn PDF document text
    • https://site-1040262.mozfiles.com/files/1040262/giwezedutaxonutorevar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57A6 5396 bytes
SHA-256: 48258cdadb56bd3f0fbf8ad6073e392ccbbc065adfd8ec8c3ffa5a846281df67
font_01_sfnt_off000069e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69E2 9968 bytes
SHA-256: bbc4929dac7e051c2d2bfc9ae8bfa74d34ed364371044541c4bf2e90c3f76c60
font_02_sfnt_off00008bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BEC 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3