Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a99382e1fe90354…

MALICIOUS

PDF

60.5 KB Created: 2020-08-14 22:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d63ee8aa7727e203fdf0ec425a59ec4 SHA-1: 7044f2779410a2e0788010e74acdcab7733fc609 SHA-256: 3a99382e1fe903546b2ec035245998bb01c2f09845df3c6bb5e1ee9d05e0aedb
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final destination of the malicious payload. The document body, though heavily obfuscated, contains the same URL and references to privacy, suggesting a lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm designed to improve search engine ranking for malicious content.

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/pify?keyword=matsui+jurina+privacy
    • http://koruj.twinriverwholesale.com/uploads/1/3/0/9/130969723/2814199.pdf
    • https://cdn.shopify.com/s/files/1/0430/5531/7149/files/zujosade.pdf
    • https://cdn.shopify.com/s/files/1/0431/2471/9773/files/58239307904.pdf
    • https://cdn.shopify.com/s/files/1/0452/3976/3101/files/vefoxejotekubixujizet.pdf
    • https://cdn.shopify.com/s/files/1/0437/6500/6494/files/chemistry_notes_for_class_12_free_download_up_board.pdf
    • https://cdn.shopify.com/s/files/1/0434/8005/5974/files/school_attendance_management_system.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/48792195127.pdf
    • https://cdn.shopify.com/s/files/1/0433/7516/5594/files/dafuwavigar.pdf
    • https://cdn.shopify.com/s/files/1/0431/5679/9647/files/34218187587.pdf
    • https://cdn.shopify.com/s/files/1/0430/8477/5577/files/2020_cadillac_srx_navigation_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000876c.bin
5b7d4b81be85f3057218a7e554491098028d559ba72edec6410836c4b96d8587
pdf-font-stream PDF embedded font (sfnt) at offset 0x876C 12364 bytes
font_01_sfnt_off0000b0dc.bin
a1c5c57d6e77fa516d139516709f47bd816818d027cdd073a969e74b078b92cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DC 5140 bytes
font_02_sfnt_off0000c275.bin
4d07ba8c2279bc4b2b8522ba07d69cdd252094d7c1147ed4697a09f4360de6ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xC275 10256 bytes