Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de2116af69126c1…

MALICIOUS

PDF

47.7 KB Created: 2020-10-03 12:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 5c56c0defdd025e445baa68628d7a3c0 SHA-1: 300b7ab851a9e3e87f3a2652543fa38970279f32 SHA-256: 4de2116af69126c1fee5328f7cbf1c1dc15dbe14ed2f388eafe84239933b81b6
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://ggtraff.ru/strik?keyword=basic+english+vocabulary+pdf+free+download In PDF document text
    • https://site-1039405.mozfiles.com/files/1039405/43398562758.pdfIn PDF document text
    • https://site-1036873.mozfiles.com/files/1036873/madonerapamumutujosaza.pdfIn PDF document text
    • https://site-1040297.mozfiles.com/files/1040297/kipijijezutezaxirokogabej.pdfIn PDF document text
    • http://vefime.vibrantpet.com/uploads/1/3/0/7/130774965/648c01.pdfIn PDF document text
    • http://files.heavencanbefound.com/uploads/1/3/1/3/131384018/tizalunovemili.pdfIn PDF document text
    • http://files.kelseysq.com/uploads/1/3/0/7/130776599/pawuj-vigisanugeguwe-zigosogome-bunusujav.pdfIn PDF document text
    • http://files.circlecitydanceproductions.com/uploads/1/3/1/8/131858044/dikilijugo_devazuk_werakurokipolu.pdfIn PDF document text
    • http://files.li-xiaolu.com/uploads/1/3/0/8/130813399/5262539.pdfIn PDF document text
    • https://site-1039754.mozfiles.com/files/1039754/97387032097.pdfIn PDF document text
    • https://site-1037003.mozfiles.com/files/1037003/tebelanimisorudex.pdfIn PDF document text
    • https://site-1039423.mozfiles.com/files/1039423/joninefugototagalikozep.pdfIn PDF document text
    • https://site-1036798.mozfiles.com/files/1036798/xamaduxuwatuz.pdfIn PDF document text
    • https://site-1040360.mozfiles.com/files/1040360/3603869928.pdfIn PDF document text
    • https://site-1039496.mozfiles.com/files/1039496/keditojusovufukepasewu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64BA 5860 bytes
SHA-256: aa4e172dd66195fc9736ae912f167876f113f265c874c2b67b7a54b028acaa06
font_01_sfnt_off000078b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78B8 10716 bytes
SHA-256: da0dc9e9ff35890ee0a4b5704a77a8f4733009c2ce0aa32465cfda9ff6d908a2
font_02_sfnt_off00009cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9CFF 16092 bytes
SHA-256: 78e01a7a6136ddf0c994a311ff069c47b68cca607dacfa0833a94a83a26a5818

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