Malicious PDF — malware analysis report

Static analysis result for SHA-256 7921e2920c580507…

MALICIOUS

PDF

47.2 KB Created: 2020-10-07 07:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: c15f996afcab60704f865abc3a35cb21 SHA-1: a6f6f4dd7ecefeb162adffe75524f4c41bee04f7 SHA-256: 7921e2920c580507f66cec071573f234d51bbf44526be355af55011e373a5eb9
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=vidmate+old+version+app++uptodown.+com In PDF document text
    • https://site-1036867.mozfiles.com/files/1036867/84241010684.pdfIn PDF document text
    • https://site-1036921.mozfiles.com/files/1036921/57872728666.pdfIn PDF document text
    • https://site-1038670.mozfiles.com/files/1038670/52497518857.pdfIn PDF document text
    • http://kilab.jericosoundsystems.com/uploads/1/3/1/4/131407014/fifapux.pdfIn PDF document text
    • http://medem.livingforlivestock.com/uploads/1/3/1/8/131857101/guzar_nukisunexapeban_jomapilafew.pdfIn PDF document text
    • http://pumewo.brendadater.com/uploads/1/3/2/7/132741024/1fec1ad1.pdfIn PDF document text
    • http://kopefi.upholsteringmelbourne.com.au/uploads/1/3/0/8/130873946/befigulevom_torewijomubebu_mobobosabukila.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://cdn.shopify.com/s/files/1/0435/4048/0164/files/reliable_ticket_sites.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5999/2993/files/bernards_high_school_athletics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8720/2971/files/the_teenagers_guide_to_the_real_world.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01ea0bea-575a-4c01-a1a1-d71aa70300bf/29644514378.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5425e07b-bb02-4581-b9f6-90d583eed392/92421139321.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af89da73-60da-46ca-b5c1-b98422f72a15/63527285469.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cdbd610-7c14-47d3-ac1b-066e074c02f7/kuxulexewuzuwa.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_off00006d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D3F 5252 bytes
SHA-256: 1d1e9b71a8ec836b4cf80ff2d4e773bbcd4c28770abfe81b49e8841e4ccdafaa
font_01_sfnt_off00007f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F13 10192 bytes
SHA-256: d7b53fad5e50cc85d1cd8196934435f19f7a6647a415491dc77c05ccf48acbb9
font_02_sfnt_off0000a1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA1F4 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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