Malicious PDF — malware analysis report

Static analysis result for SHA-256 5084c2964a1d396c…

MALICIOUS

PDF

47.6 KB Created: 2020-10-27 11:25:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: f53f1cc79084feb0d4f2109f1f4c07a9 SHA-1: 979ff6e10a6a305178c75b612a4dabb5a86bbf76 SHA-256: 5084c2964a1d396cf57dbeae6c484157cbf9e8c18b52ed5e1289354135da11eb
194 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/pify?keyword=cursive+sentence+writing+practice+book+free+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367005/normal_5f958c13aceb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389366/normal_5f96cbd0afc9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377113/normal_5f8f469a0ec6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367646/normal_5f89ccd65fcf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367656/normal_5f89f9425283e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387807/normal_5f9369db2de88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385004/normal_5f95309a76655.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00007c4b.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00007c4b.bin)
    • https://s3.amazonaws.com/tetazino/kopafanosekejuvobu.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/waves_audio_plugins.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/handbook_of_clinical_anesthesia_7th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/technical_interview_questions_for_civil_site_engineer.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/pdf_to_word_converter_app_for_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/9680/5028/files/63864270785.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/1155/3473/files/85725750985.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/15594628567.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/tecnica_de_alimentacion_enteral.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/christian_names_and_meanings.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 extracted file (font_00_sfnt_off00007c4b.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C4B 5584 bytes
SHA-256: a5509074eac5a1d737cdb1b3015b624cfb081a544aeb31235c8c253140e3f007
font_01_sfnt_off00008f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F73 9928 bytes
SHA-256: 1249e96abdaaf36f238eda68afe4ce4611e033e31c068c7745ed573f7a214b56