Malicious PDF — malware analysis report

Static analysis result for SHA-256 440e511dc87cf6ed…

MALICIOUS

PDF

41.8 KB Created: 2020-08-31 09:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebcdea8d595fd0a42cd2fa3053128ea9 SHA-1: 7e601669ff1d2c63961ef8ffd26539ca1155d8f5 SHA-256: 440e511dc87cf6ed8b0fcb68a973ee2b9a02ad3e50054fa039a2a93c5f8eb38f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body, though partially garbled, also contains this URL and numerous other links hosted on Shopify, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to a malicious site via a link embedded within the document.

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://ttraff.ru/wix?keyword=455+du+code+de+proc%25C3%25A9dure+civile
    • https://cdn.shopify.com/s/files/1/0429/9200/9379/files/jorakusemelodimexixeto.pdf
    • https://cdn.shopify.com/s/files/1/0433/2240/9125/files/investigator_site_file_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/4950/8250/files/30579810914.pdf
    • https://cdn.shopify.com/s/files/1/0436/3842/3710/files/calendrier_2020_avec_numro_de_semaine__imprimer.pdf
    • https://cdn.shopify.com/s/files/1/0434/9411/3446/files/94096878829.pdf
    • https://cdn.shopify.com/s/files/1/0435/9897/1038/files/88799435880.pdf
    • https://cdn.shopify.com/s/files/1/0450/9381/4435/files/39441028386.pdf
    • https://cdn.shopify.com/s/files/1/0430/0649/2823/files/lois_griffin_tatum_hentemann.pdf
    • https://cdn.shopify.com/s/files/1/0450/1107/5222/files/technical_aptitude_questions_with_answers_for_ece.pdf
    • https://cdn.shopify.com/s/files/1/0430/8667/6117/files/14573857843.pdf
    • https://cdn.shopify.com/s/files/1/0430/6134/6466/files/2523181559.pdf
    • https://cdn.shopify.com/s/files/1/0430/2074/6906/files/baresebaxewufakif.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5823/files/robakezoja.pdf
    • https://cdn.shopify.com/s/files/1/0427/9320/5916/files/japugugoliwuni.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000631e.bin
ee18fb2c916201060dcc87623f02b9202efc932613265c6a401a847cba14f0d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x631E 5000 bytes
font_01_sfnt_off000073e8.bin
4d32cfccb616ece18a1a764fc3bab4bca2b6ed4b307467c810170272fccee856
pdf-font-stream PDF embedded font (sfnt) at offset 0x73E8 11600 bytes