Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8d3d24516ea185…

MALICIOUS

PDF

42.8 KB Created: 2020-11-05 16:51:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ecffc6c35781fda0995a077591d6bdac SHA-1: 33a57612990cc26549b68474642212bd85456c81 SHA-256: 1a8d3d24516ea185d19b71621fd788f289cc1905e880944bf55b6b3975ad393f
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file, disguised as a 'Yugioh kaiba battle city deck list', contains an embedded URL that redirects to a suspicious domain. The ML classifier strongly indicates maliciousness, and the PDF structure includes multiple external URIs, suggesting a phishing or redirection attempt. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/strik?keyword=yugioh+kaiba+battle+city+deck+list PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420438/normal_5f9c9ca8acfbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368497/normal_5f88bf6d6c764.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402262/normal_5f99e62ed37f2.pdfIn PDF document text
    • https://vimiwegom.weebly.com/uploads/1/3/0/7/130775837/2777587.pdfIn PDF document text
    • https://ruwadegefanum.weebly.com/uploads/1/3/4/1/134108857/12f4a7b5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409616/normal_5f9e612dab785.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457848/normal_5fa0ce6bf2f8b.pdfIn PDF document text
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/xoriratapepekum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369307/normal_5f8881bd79648.pdfIn PDF document text
    • https://luwobidope.weebly.com/uploads/1/3/0/8/130814225/biziv-tabetipanulaber.pdfIn PDF document text
    • https://rukinedofixod.weebly.com/uploads/1/3/4/3/134348838/resuxuzuk-xubafevekejativ-vemogirokop-bukazijo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375077/normal_5f9aaf028d571.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/69462254827.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5287/5424/files/16470785960.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/accounting_standard_2_icai.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0917/8281/files/72253610187.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_off00006800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6800 5372 bytes
SHA-256: cee327e4484d3a7f767a8bd4eecf81e70c3994c900100ff50669777b903dc207
font_01_sfnt_off00007a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A51 10444 bytes
SHA-256: 43535831a909243b1b37126cea5530e1f4fe11373efcdce09585fc6387030f08