Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b3c81405979d61…

MALICIOUS

PDF

42.4 KB Created: 2020-10-11 01:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a2cc06f224eff6c7f331947fa6cc7fd1 SHA-1: 902a777e7ff6907a7e3b0f97474ab6917c85afb3 SHA-256: 23b3c81405979d618bd54bc1014d9d35ed5b021d91b10974cb0dd144ae5d1be3
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to disposable hosting and a known malicious redirector. This indicates the document is designed to lure users into clicking malicious links, likely to download further malware or lead them to phishing sites. The ML classifier also strongly flagged this PDF as malicious.

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://ttraff.link/pify?keyword=punchline+bridge+to+algebra+pdf In PDF document text
    • http://files.seattlefirstbaptist.org/uploads/1/3/2/3/132303080/81e42db7c9176.pdfIn PDF document text
    • http://bubekek.rodsartgallery.com/uploads/1/3/0/8/130874063/032517a6.pdfIn PDF document text
    • http://fapane.readthemandeat.com/uploads/1/3/0/7/130776415/785c97d07.pdfIn PDF document text
    • https://site-1039748.mozfiles.com/files/1039748/bigugu.pdfIn PDF document text
    • https://site-1037111.mozfiles.com/files/1037111/61910102294.pdfIn PDF document text
    • https://site-1038743.mozfiles.com/files/1038743/68363879770.pdfIn PDF document text
    • https://site-1037184.mozfiles.com/files/1037184/jotiguti.pdfIn PDF document text
    • https://site-1037187.mozfiles.com/files/1037187/97167984.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/243c39f6-b987-4693-be84-936f799d6fce/lavovaxusubexiderabi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2980517-e516-4f54-948d-1dcd93b43d63/9427703422.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc7653c3-3168-495a-b1d6-f0c1223bd3ac/juxuvivojumatawejotaweru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82b79c14-58db-4202-a022-dfcb2fb76347/juxokexebaxezudulab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/5504/6560/files/mice_vs_rats_droppings.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0469/0558/9920/files/stock_tank_heater_solar-powered.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1052/2277/files/lurisakominipiwapej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/5312/5284/files/loridalefexapelotazoxituw.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_off0000674a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x674A 5380 bytes
SHA-256: 55bc362a17c169c704d34de36f289c31a17294a9e7c15529fd5f95caa0f3b122
font_01_sfnt_off0000797c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x797C 10376 bytes
SHA-256: 32baf77c4bed793281f567b642fba5088865f7366e675b0747e53da76ef88adb

Open this report in the interactive analyzer, or submit your own file for analysis.