Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e437cfb75a3e29…

MALICIOUS

PDF

41.1 KB Created: 2020-11-04 20:59:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3cd9cfed8deb23c2429ca6fa1acbf2eb SHA-1: 1f02bfae9003068da1a5591692a64bc8f413562b SHA-256: 73e437cfb75a3e2951af8b8de1fc7539071af04216d1cac7ce788217e88d1f32
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=nypd+radio+codes+quiz In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384471/normal_5f9e05ac93d0d.pdfIn PDF document text
    • https://nikokabiliru.weebly.com/uploads/1/3/1/4/131409463/7637447948739.pdfIn PDF document text
    • https://wubigunes.weebly.com/uploads/1/3/4/5/134507070/nadironutikisokarama.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413850/normal_5fa1fa51ec47b.pdfIn PDF document text
    • https://sotokogel.weebly.com/uploads/1/3/4/2/134266154/4f04eb040bff.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/warapagefasovi/unit_2_study_guide_economics.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/pokemon_sword_and_shield_expansion_pass_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/39445355529.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/wezajarukugefiwipudul.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/pokemon_tower_defense_4_samdangames.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/pujosilerut.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/rigid_rolling_tool_box_system.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/69847119725.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/antirheumatic_drugs.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/28377631846.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/eve_online_beginners_guide_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/aerodynamics_lecture_notes.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_off00006024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6024 5280 bytes
SHA-256: 77af23c3946d75527b3e2a9d52fd71902ada3951f3f8a2dfd62718581ebf8ff1
font_01_sfnt_off0000723a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x723A 11336 bytes
SHA-256: 6eec3d5bbc8a6b707c6bc7ec8a1375dd824ac2bf06ee780799a6279e5b74f1d3