Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f6a54f067c0c522…

MALICIOUS

PDF

42.4 KB Created: 2020-09-01 14:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25439a658e70a66a5b25046d3708bc40 SHA-1: 1c1ec4de0677688ac97845a92afd100c23eff090 SHA-256: 6f6a54f067c0c52247701998808ac4d855cfab73767a29a0e4f5bd9f232e8dad
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, ttraff.club, 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 other PDFs, suggesting a link farm or SEO poisoning tactic to increase visibility. The ML classifier also strongly indicated maliciousness.

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.club/wix?keyword=agro+ecological+zones+of+pakistan+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/6c98bc_5e2c6a7780084a47906a24a98ef1adb6.pdf
    • https://static.usrfiles.com/ugd/b8c837_87e67cb6cc884dda9b20febff742b9d9.pdf
    • https://static.usrfiles.com/ugd/4826f5_34f0d2e8cacc491cae8d53a2a1934035.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_72d281877dcc40e3afe7eab67dd2771d.pdf
    • https://static.usrfiles.com/ugd/b48b60_2d8995500b864d1c91917a58c2d2e28f.pdf
    • https://cdn.shopify.com/s/files/1/0434/5053/2001/files/murofesaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/2136/8482/files/livro_zen_budismo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4585/5137/files/33972879473.pdf
    • https://cdn.shopify.com/s/files/1/0430/7514/1783/files/fikatutaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/82782017610.pdf
    • https://static.usrfiles.com/ugd/26481d_a5ad1c9fa5c24b02818bff6764052afd.pdf
    • https://static.usrfiles.com/ugd/57c819_00afbe3590fa475d8799e8993079aaca.pdf
    • https://static.usrfiles.com/ugd/7d21c0_6b89edfb745a44459c348741bbb22847.pdf
    • https://cdn.shopify.com/s/files/1/0443/6351/4012/files/branches_of_biology_list.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50751207741.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0810/files/titiritolukubaxoworifa.pdf
    • https://cdn.shopify.com/s/files/1/0433/8935/4149/files/observe_and_report_2009.pdf
    • https://cdn.shopify.com/s/files/1/0437/8044/0213/files/fodelupaluwejoka.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000675b.bin
9e16f74e926b7d0ea2665a0ea6fc699087ad4f9da97d9a0a6e26c9b5358513a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x675B 5424 bytes
font_01_sfnt_off000079f2.bin
4b08470cc1ffc571bd65f02230ba646d4694fb64a9af5000714ee1f9c4543755		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79F2 10160 bytes

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