Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b6da3b42cf6fc3f…

MALICIOUS

PDF

40.4 KB Created: 2020-10-02 01:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: df1010d3df76f93a152a24783a44346f SHA-1: 8951d6ffb00fde8f45c58d4a1ad6dbd3f08a76f9 SHA-256: 8b6da3b42cf6fc3f618c9f9e8dd893ff0e2aa012fb783956a90cdae3c5842b50
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, specifically a URL designed to serve malicious content. The document body, though heavily obfuscated, contains a URL that matches the heuristic firing for a malicious redirector. The presence of numerous external PDF links, many pointing to similarly structured URLs, suggests a link farm or SEO poisoning tactic to distribute malicious content.

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=regents+physics+worksheet+1.1.3+acceleration+answers In PDF document text
    • https://site-1036725.mozfiles.com/files/1036725/tipugupurijuk.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/bd8bbe7b-cedd-41b0-a1ee-6d5aa48ad7cd/nuwinasireva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39d3972a-f38a-434e-adfd-9cea1a756ade/puwidexijanulibol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9083b3d6-e9df-47f0-a005-a11b6af9c164/kofomuwamifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d15ab62-0a41-4460-b74e-baddcf2f12f5/61056838121.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/2240/0674/files/microsoft_windows_search_filter_host_windows_10.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0179/7019/files/nomugokaridonelurabusi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/2508/8679/files/zekuzisuverufapagubup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/6217/1550/files/ryan_mears_rate_my_professor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/3965/7631/files/sims_4_torrent_mac_catalina.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_off00005e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E51 5708 bytes
SHA-256: c1925f9f19276f94ca890a703f1fed8facefefae095d9cd4d57cdbfaceca19bb
font_01_sfnt_off000071ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71EA 10228 bytes
SHA-256: 0b56575b250311ee10a37a50553df76735ce557b22e11fd6d73e36d9e0e49237

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