Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7fd2ae256754d71…

MALICIOUS

PDF

39.1 KB Created: 2020-10-04 02:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b0700b913bb1b1b557cf03c5741664f7 SHA-1: e322785217d398d6464d174c2c113c72bec6e394 SHA-256: d7fd2ae256754d7181c8a4fa192f1dce29c2ea8033d29c2a10a3e75623d4068b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of these links, 'https://cctraff.ru/strik?keyword=auditor+general+report+2020+ghana+pdf', is identified as a known malicious redirector. The document's structure and content suggest it is designed to lure users into clicking these links, potentially leading to further malicious activity.

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=auditor+general+report+2020+ghana+pdf In PDF document text
    • http://files.myjamesandrews.com/uploads/1/3/1/0/131069763/8510373.pdfIn PDF document text
    • http://files.voyageurdusoleil.com/uploads/1/3/1/3/131379991/5405162.pdfIn PDF document text
    • http://files.sandramoberdorfer.com/uploads/1/3/0/9/130970006/8521673.pdfIn PDF document text
    • http://xulup.biketheswell.org/uploads/1/3/2/6/132682871/vofabililolak.pdfIn PDF document text
    • http://files.sharynjackson.com/uploads/1/3/1/8/131856247/7300048.pdfIn PDF document text
    • http://files.socialstockwoman.com/uploads/1/3/2/8/132814097/pigarotow-movubiromitux-meferibuz-vobepupa.pdfIn PDF document text
    • http://files.foxchapelnewcomers.org/uploads/1/3/1/4/131407734/xatoxerejafej.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/2bdb68ae-cfef-49db-9037-a6ecf6a0944f/wonapetoki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94be63da-7598-42f2-8ce3-6872ecab4641/dabawogisutezelewowo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e64ec64-f168-491c-a065-e51bb3ca07c1/bixinidozupefeki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5723/1525/files/71609730083.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9357/3288/files/wave_physics_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/1592/1818/files/tamuzafekapumeliratag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/0118/4931/files/the_man_in_the_water_theme.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5959/0806/files/darivekelak.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_off000058e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58E1 5388 bytes
SHA-256: 9e7777b16f09f25b56eb14e6688149bcf9e162b176c5fa66fa1032aaf50a4e6a
font_01_sfnt_off00006b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B33 10592 bytes
SHA-256: 7cd2aebb1b0b9f70489ed6ed8efaf45163d4e932eaeb0e48d23e54fbbb738a2f

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