Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c56c1bf6fd58c69…

MALICIOUS

PDF

47.4 KB Created: 2020-10-15 03:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: c429793c9e685411fdef3e8c115ca1e1 SHA-1: 57866fd1979c77ae607cc94f74a540c7b68ad92a SHA-256: 0c56c1bf6fd58c696cbc5345473e8816358f9f63d33489d6b8bf9877c2aa1fdb
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/strik?keyword=google+classroom+apk+download In PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/a8401ec7a9859.pdfIn PDF document text
    • https://liwevapazu.weebly.com/uploads/1/3/1/0/131071299/ee1b44a.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/lonevu.pdfIn PDF document text
    • https://gemenudotipetal.weebly.com/uploads/1/3/2/6/132695720/narobubo_nilaguvuzuvujeb_gomezu_fexogufuputat.pdfIn PDF document text
    • https://jedunaxalow.weebly.com/uploads/1/3/1/6/131606453/xutanabu.pdfIn PDF document text
    • https://site-1036864.mozfiles.com/files/1036864/82515863565.pdfIn PDF document text
    • https://site-1039848.mozfiles.com/files/1039848/31299018337.pdfIn PDF document text
    • https://site-1039290.mozfiles.com/files/1039290/92649245018.pdfIn PDF document text
    • https://site-1037856.mozfiles.com/files/1037856/41073429587.pdfIn PDF document text
    • https://site-1038879.mozfiles.com/files/1038879/pujijabonasosarepu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365549/normal_5f87011c569b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366400/normal_5f877043ebb9a.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/606e0f45-1ca7-42c5-a4da-c9729e663075/41728902920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7db09b44-b327-4311-ac57-11d6177d15c4/18631707534.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b4e1b0c-ea8e-4272-b964-ec79d9ed13d4/25450987476.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a46de96-38d3-492f-835c-48b6d7e499b6/bivabisafiributoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/384bbf07-aabe-4191-a523-44c7427b9184/nubosuriwutet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b42b649a-edab-4ddc-9d60-c8a1eeff6109/nigoxowurepapamakej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24a23e3a-dac5-4e0d-9da9-2f641696daaf/64248223719.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58b2b2a5-e629-4a50-a46e-73683fd559e8/92208177155.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8573/5105/files/80217796405.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2675/7786/files/24422711576.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/0596/8285/files/latibuxosavugepevojovolu.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_off00006cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD1 3500 bytes
SHA-256: e42012e0a20de963b83d9bf476a601e1e1e43fced2be95fde6cbf99cc1139275
font_01_sfnt_off0000796f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x796F 5580 bytes
SHA-256: aa1659d918a6d790567c504ee6e9ab6f335ae85dfe5cb02a56296947cc46c99c
font_02_sfnt_off00008c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C67 10384 bytes
SHA-256: f62df4b99092923f66c29bfd5a9e399d2795a73ec3821fbdb3ae85db9983d3cb