Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc9ffb649f18242…

MALICIOUS

PDF

48.3 KB Created: 2020-08-30 02:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11970a6eef7f6e6263d71cc80984603d SHA-1: 5e1b39afc1eb081d52c6506654b8d14739dc1898 SHA-256: adc9ffb649f1824295dbdd74cc1df10a0271044a4585f6269edc30985e0e214f
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains numerous embedded URLs, with one pointing to a known malicious redirector (ttraff.ru) and others to Shopify, likely serving as a distribution point for further malicious content. The primary attack pattern involves luring users to malicious sites via these embedded links.

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=s%25C4%25B1n%25C4%25B1f+%25C3%25B6%25C4%259Fretmenli%25C4%259Fi+%25C3%25B6abt
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/wajalefupedekakelafa.pdf
    • https://cdn.shopify.com/s/files/1/0428/3986/7559/files/2526500630.pdf
    • https://cdn.shopify.com/s/files/1/0435/5486/5320/files/kinamipifib.pdf
    • https://cdn.shopify.com/s/files/1/0427/9199/3500/files/87858900974.pdf
    • https://cdn.shopify.com/s/files/1/0432/1283/2931/files/61475109307.pdf
    • https://cdn.shopify.com/s/files/1/0431/7193/8453/files/english_guide_for_class_9_kpk.pdf
    • https://cdn.shopify.com/s/files/1/0431/0079/9140/files/basic_mathematics_algebra_formula.pdf
    • https://cdn.shopify.com/s/files/1/0430/2556/3799/files/kigebixonuxawupi.pdf
    • https://cdn.shopify.com/s/files/1/0430/1144/0803/files/44951187965.pdf
    • https://cdn.shopify.com/s/files/1/0434/4433/8838/files/nikolum.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_off00007188.bin
b4cb4513f26fdceda04cb004db6d84cf986b6563e52d796c39c5d31af9451e82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7188 5376 bytes
font_01_sfnt_off00008381.bin
2f40f0c6c7b9470a7a18fce424d74c6590af28aabad4ba0d3a2071b61e992e9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8381 16484 bytes

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