Malicious PDF — malware analysis report

Static analysis result for SHA-256 477d4b4c8835ad2c…

MALICIOUS

PDF

110.0 KB Created: 2021-01-09 23:26:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 67e82ea5376702af9c2e080fde639c6f SHA-1: eeb709cfb6734aee945be24b29b06e833f05be75 SHA-256: 477d4b4c8835ad2c0d78449aa4329f4302ba6368f707bab4a6b911919026945f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to a 'Latin derivatives list'. The primary attack pattern involves directing users to malicious sites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffmen.ru/123?utm_term=latin+derivatives+list In PDF document text
    • https://site-1176776.mozfiles.com/files/1176776/57739626812.pdfIn PDF document text
    • https://site-1168346.mozfiles.com/files/1168346/table_top_racing_world_tour_apk_rexdl.pdfIn PDF document text
    • https://site-1174506.mozfiles.com/files/1174506/nalekurosetudimig.pdfIn PDF document text
    • https://riwurarelix.weebly.com/uploads/1/3/4/4/134484082/1447208.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385636/normal_5f9d34361c1be.pdfIn PDF document text
    • https://site-1171954.mozfiles.com/files/1171954/54153150889.pdfIn PDF document text
    • https://site-1175681.mozfiles.com/files/1175681/koxozinifawibadomiruden.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/guwutivupudutu/angular_reactive_forms_valuechanges_validation.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/javilolulaluluj.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/as_cavernas_de_ao.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/mailjet_api_template.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_off000176c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176C9 4820 bytes
SHA-256: b5e636ab2cb217d07ebda7be7285be6073b9c677133edb797d30b037b57e232e
font_01_sfnt_off00018740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18740 10788 bytes
SHA-256: aa383cf7e8d210d1ea42c2e8fdb29f38ea5826f22149e98dde37add146327f48