Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c677baacdd823f4…

MALICIOUS

PDF

53.6 KB Created: 2020-11-04 07:20:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: 05d398ccdf9d45fd25675721768800da SHA-1: ad0e171f448c5c3bf0c034ae303e9102f6e2eb46 SHA-256: 8c677baacdd823f400a02629a4be41cfa6c1462800062286f191b6c8d20fe720
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://cctraff.ru/123?keyword=rheem+3+ton+ac+system+14+seer+review In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375355/normal_5fa1765cefd0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365601/normal_5f9a1871a378e.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/1897080.pdfIn PDF document text
    • https://julapaxukej.weebly.com/uploads/1/3/4/4/134492969/2204842.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/e6a04.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/tunik_kagetaziror.pdfIn PDF document text
    • https://rajaxamakato.weebly.com/uploads/1/3/2/3/132302926/5415284.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375708/normal_5f985a338f9ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380395/normal_5f8f369144f96.pdfIn PDF document text
    • https://pasuliwipo.weebly.com/uploads/1/3/1/4/131452824/682670cc.pdfIn PDF document text
    • https://jonowukamox.weebly.com/uploads/1/3/4/3/134372820/surugimowo.pdfIn PDF document text
    • https://lojapajarete.weebly.com/uploads/1/3/4/5/134521209/1189718.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370053/normal_5f8a656d3f456.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
    • https://uploads.strikinglycdn.com/files/a96c63fd-a85a-4786-87a3-a4e06ea76dc5/ruzitijujeganuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7de3fcc1-3244-4932-9e4b-fe30cd1faa29/crafting_guide_osrs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee072242-61aa-4064-85ba-beee1694e9c8/12452920058.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000845e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x845E 5360 bytes
SHA-256: cb8841fab18ccef989efa04baaf952a5ffff36b10f888385fa0b1d01529a31e5
font_01_sfnt_off0000968b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x968B 10700 bytes
SHA-256: 272f7288e7eaa917fec97f27bdd8bdfe1b08da7fda481203ee3d364cca3def66
font_02_sfnt_off0000bb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB35 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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