Malicious PDF — malware analysis report

Static analysis result for SHA-256 223ed3259407ac02…

MALICIOUS

PDF

40.5 KB Created: 2020-08-30 21:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de9f75bca83e17c775c760b6554bedb4 SHA-1: 6b52a2693ea0c140ac6a862f3b582292fc5e301c SHA-256: 223ed3259407ac02d288e5471906380a28ba1f32b694c7bd9eaacc781b3dc5ca
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=purity+vst+free+download'. This URL is likely used to redirect users to a malicious download site. The PDF also exhibits characteristics of a link farm, with numerous embedded links, including one to a Shopify domain. The ML classifier strongly indicates maliciousness, supporting the conclusion that this PDF is designed for malicious redirection.

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=purity+vst+free+download
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/59973286363.pdf
    • https://cdn.shopify.com/s/files/1/0434/8667/5109/files/public_administration_an_action_orientation.pdf
    • https://cdn.shopify.com/s/files/1/0428/5012/3943/files/59933599967.pdf
    • https://cdn.shopify.com/s/files/1/0428/4828/8934/files/16516825279.pdf
    • https://cdn.shopify.com/s/files/1/0429/8434/1657/files/variateur_de_vitesse_altivar_11.pdf
    • https://cdn.shopify.com/s/files/1/0445/8138/8452/files/hit_em_high.pdf
    • https://cdn.shopify.com/s/files/1/0434/4355/2416/files/a_poder_em_suas_palavras.pdf
    • https://cdn.shopify.com/s/files/1/0433/2208/1448/files/siwabodagaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/9484/3293/files/akasam_thana_rekkalatho_video_song_free.pdf
    • https://cdn.shopify.com/s/files/1/0439/6518/6206/files/babida.pdf
    • https://cdn.shopify.com/s/files/1/0429/1713/4502/files/uzreport_tv_futbol_pryamoy_efir.pdf
    • https://cdn.shopify.com/s/files/1/0435/7927/7467/files/sipiluj.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_off000061c4.bin
ffef504e6f9beaaf56060d8c2bfd67376caca4988679a47f8e5866fb24650065
pdf-font-stream PDF embedded font (sfnt) at offset 0x61C4 5156 bytes
font_01_sfnt_off00007376.bin
477e32af752ed5bfb3819982f8541f1b60d0513629eded4d073b5a175621ab09
pdf-font-stream PDF embedded font (sfnt) at offset 0x7376 10052 bytes