Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac82c52355ebf26d…

MALICIOUS

PDF

49.0 KB Created: 2020-11-09 08:45:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: a09f299d7b91647248ca41e9ff950b48 SHA-1: 872a7edfa886d89c6edc1c8b13a7666cca013caa SHA-256: ac82c52355ebf26de414f442d4465d588320c67c1b9f65fc3aa7246f659d71eb
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://traffmen.ru/123?keyword=elton+john+songs+from+70s In PDF document text
    • https://cdn-cms.f-static.net/uploads/4407313/normal_5fa8b36ae0ed9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427501/normal_5fa585eec9173.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367674/normal_5f8760cd73a45.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://davonezoman.files.wordpress.com/2020/11/dedusibonugomavev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02bd60a2-136e-4835-a763-8a36d996c624/dieta_para_ectomorfos.pdfIn PDF document text
    • https://bikebixenevi.files.wordpress.com/2020/11/video_game_startup_business_plan.pdfIn PDF document text
    • https://zovuwisubof.files.wordpress.com/2020/11/wilekepisexatiju.pdfIn PDF document text
    • https://nonoxogudege.files.wordpress.com/2020/11/77223613237.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/411eff4b-c989-466a-8c75-7289813d1471/la_maison_de_bernarda_alba.pdfIn PDF document text
    • https://boxogaxixum.files.wordpress.com/2020/11/dream_on_club_midvale_utah.pdfIn PDF document text
    • https://topiledobo.files.wordpress.com/2020/11/35882275501.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16ec6ddf-9287-495f-87aa-fab50924363f/genebofiwavabukoxofigil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/757dc8a0-e6cd-4878-bd79-767662ef2667/68048637306.pdfIn PDF document text
    • https://pupirod.files.wordpress.com/2020/11/sagob.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_off00008131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8131 5228 bytes
SHA-256: 022efeaa89a9bd937cca95aeaccce903fee37d07dfd4ee4607fd4d1849e29363
font_01_sfnt_off000092e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92E6 10700 bytes
SHA-256: 1e13122e53de143d38aaa054fc604040aa668580c9c4dfd09f867d4feb6783b9

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