Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f92723f010de08e…

MALICIOUS

PDF

34.2 KB Created: 2020-11-01 13:29:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f377d433511ff8bf1b9b56f3031b9843 SHA-1: 2fef3e1e30cde5bb8b74b8f37e74e62323887506 SHA-256: 8f92723f010de08eaa07628c9acb426462688ce3e455d26a0b4d78e2d8c4c927
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://ggtraff.ru/strik?keyword=hockey+night+in+canada+ringtone In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387226/normal_5f990954e4162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393625/normal_5f8e7c0882247.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/203d9490-62b6-4769-9fb6-6409d883855f/16863577653.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/1241/4376/files/instructional_assistant_salary_kentucky.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/8519/4150/files/22922752207.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c10fc45d-aceb-4917-8b05-d834d7c2d9e8/iso_16949.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/516f3ff7-fd18-4542-b4ad-e0a21f1dd775/55851213320.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/59550029580.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/85040630321.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5699/6245/files/6430875095.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9038/6337/files/44611783767.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_off00004bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BC5 5120 bytes
SHA-256: c60a322ba62a4414d29e10d9fc4aa00df089cf059e006b8b50f25c2b9cbfcacb
font_01_sfnt_off00005d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D2F 9224 bytes
SHA-256: 8f42e51517dc4e07a07767cd987d519a198c5fa367417c32e1af97f5d1ca88ea