Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ea61c920f9a95b…

MALICIOUS

PDF

56.9 KB Created: 2020-11-09 08:13:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: ca0dcd8b779e257f06a4679d5fc124c0 SHA-1: 5de11947a8dfff3e10894c0656cf10c34d37dfec SHA-256: 81ea61c920f9a95b7b3e84805237a9b855231974ff002c30f8ec1c697540e71f
184 Risk Score

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://traffmen.ru/123?keyword=no+man+s+sky+economy+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375357/normal_5fa59b08c15a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366400/normal_5f8f508eac279.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/sowewazulejewi/access_limited_brands_login.pdfIn PDF document text
    • https://vipuvixo.files.wordpress.com/2020/11/nojanum.pdfIn PDF document text
    • https://vinojuxilopi.files.wordpress.com/2020/11/wafiza.pdfIn PDF document text
    • https://pupejuw.files.wordpress.com/2020/11/rutuwefopelewuson.pdfIn PDF document text
    • https://mepugen.files.wordpress.com/2020/11/merriam_webster_vocabulary_builder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38dd3513-70c2-4e49-81c5-241144810f8f/sotukaxobojolizagor.pdfIn PDF document text
    • https://xobonub.files.wordpress.com/2020/11/tejubimowenifow.pdfIn PDF document text
    • https://nimiforaxub.files.wordpress.com/2020/11/the_scarlet_letter_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/501828b2-058f-4fed-9c46-a30c5f10d7b9/67260591864.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/tijawe.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/ielts_academic_reading_sample_tests.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c05d3cec-2989-49b8-877e-5da42e096889/64688195360.pdfIn PDF document text
    • https://vopeloreva.files.wordpress.com/2020/11/nice_classification_english.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_off00009f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F01 5268 bytes
SHA-256: c611a9b61b339c3470232b9f8c960b86ba7abaff9126f3885c788a574224cecf
font_01_sfnt_off0000b0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0ED 10944 bytes
SHA-256: cde1ea0ad6dc7a4439966e78f6cce2b4a234ad2b5fa56cdaebe8d2d6da33c4a3

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