Malicious PDF — malware analysis report

Static analysis result for SHA-256 613a5a8914a0241a…

MALICIOUS

PDF

43.5 KB Created: 2020-10-04 20:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 638245223c9a276ea67c6aba4546aa6d SHA-1: e886e68053fcc45c0d99717970517d73306441a9 SHA-256: 613a5a8914a0241a57c36454a3501760a3f76ffaec223a5321d57bbdb8c9b3e9
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=39+clues+viper%2527s+nest+pdf In PDF document text
    • https://site-1037824.mozfiles.com/files/1037824/govunamo.pdfIn PDF document text
    • https://site-1043098.mozfiles.com/files/1043098/79114028011.pdfIn PDF document text
    • https://site-1037205.mozfiles.com/files/1037205/gasevepodetitibosax.pdfIn PDF document text
    • https://site-1039838.mozfiles.com/files/1039838/62451226086.pdfIn PDF document text
    • http://ninen.stephanrichter.com.au/uploads/1/3/1/4/131454762/e7be88e.pdfIn PDF document text
    • http://files.learningandbehavior.org/uploads/1/3/0/9/130969054/e3cb79b62f01.pdfIn PDF document text
    • http://fupudi.camdencollaborative.com/uploads/1/3/2/7/132712127/govekenewetarid_fijif.pdfIn PDF document text
    • http://files.cloud9creationsuk.co.uk/uploads/1/3/0/8/130813606/mawomulamazexene.pdfIn PDF document text
    • http://files.kimonodesigns.com/uploads/1/3/0/7/130740173/d12073d434a7.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/ac057fb6-96d5-495e-8fc3-6023a4fcf751/10856637752.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d29a3d7-f691-4197-a0df-bcf6172dc8a5/kipefonegevavi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f25b957c-3f14-4151-95bd-9e1074a0c48a/99194617169.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e07584ab-72ef-42da-821f-13aa68d57dd8/86046827028.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2088/3880/files/7949138386.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6604/3801/files/70604039143.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_off000065f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65F7 5260 bytes
SHA-256: 92665a63d58bd29862858ec6e16ffbb4981b553cfe7767678250a78487b1f9ed
font_01_sfnt_off000077f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77F8 12928 bytes
SHA-256: 79cf94a68f3eda279279aa6b1662f335b29d1755b287e4488022da6344376209

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