Malicious PDF — malware analysis report

Static analysis result for SHA-256 c02a53430fd3c434…

MALICIOUS

PDF

45.3 KB Created: 2020-08-28 23:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e727c5631b34e7ab1ec8f70a6ed989ff SHA-1: 7b0e3df55a1baf8762505b8a481a425dd1c50ac4 SHA-256: c02a53430fd3c434291967b87dffb88c575c03a4cdd749401e0161aaae243b5a
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector at 'https://ttraff.ru/wix?keyword=homemade+woodworking+tools+pdf'. The document body, though heavily obfuscated, appears to contain this URL as well. The presence of numerous other links to Shopify-hosted PDFs suggests a link farm or SEO poisoning tactic to increase visibility and lure victims. The ML classifier strongly flagged this PDF as malicious.

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=homemade+woodworking+tools+pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6248/files/mujerimesoratufa.pdf
    • https://cdn.shopify.com/s/files/1/0439/2573/3531/files/sql_server_2020_new_features_for_dba.pdf
    • https://cdn.shopify.com/s/files/1/0429/2562/1404/files/ambaji_aarti_audio.pdf
    • https://cdn.shopify.com/s/files/1/0451/0262/9016/files/proyecto_de_lombriz_roja_californiana.pdf
    • https://cdn.shopify.com/s/files/1/0436/2957/6352/files/29160832074.pdf
    • https://cdn.shopify.com/s/files/1/0451/1324/5848/files/nissan_owner_portal.pdf
    • https://cdn.shopify.com/s/files/1/0431/1947/6896/files/icse_english_grammar_book_for_class_10.pdf
    • https://cdn.shopify.com/s/files/1/0440/8259/3957/files/xofogesaduzigukavabadipud.pdf
    • https://cdn.shopify.com/s/files/1/0429/7038/2490/files/aspectj_android_example.pdf
    • https://cdn.shopify.com/s/files/1/0430/5059/8562/files/guliwovigofe.pdf
    • https://cdn.shopify.com/s/files/1/0434/4519/0821/files/99862630354.pdf
    • https://cdn.shopify.com/s/files/1/0433/9515/4070/files/woxasokalal.pdf
    • https://cdn.shopify.com/s/files/1/0457/4127/7340/files/63542151668.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/
    • https://cdn.shopify.com/s/files/1/0431/1947/6

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072d5.bin
78eb900219e884c4e1ad80241b4f60bb2b628fcd31046ff5ea96bd2adf9b1b01
pdf-font-stream PDF embedded font (sfnt) at offset 0x72D5 5476 bytes
font_01_sfnt_off00008571.bin
3de60b18bfdb69b8caea66cb79c9d8234d593a1e3cddd3aee0e5a36c8587845a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8571 10128 bytes