Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4357f56a877e691…

MALICIOUS

PDF

48.9 KB Created: 2020-09-07 22:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b0fb24ffb97e5c8181909bcbbf89329 SHA-1: 56f16285c3de35dac902c931efe0c627692e00cf SHA-256: b4357f56a877e691187d9a8f3d38ea0bb53867cdfbf98fdc59ca46c37e661b33
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.link/wix?keyword=bass+guitar+training+pdf'. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs. The document body, though heavily obfuscated, contains the same lure text and URLs, suggesting the primary intent is to redirect the user to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.link/wix?keyword=bass+guitar+training+pdf
    • https://static.usrfiles.com/ugd/b9801a_ca6d73a6bac74fc7a92f2a00f8a6a572.pdf
    • https://static.usrfiles.com/ugd/85d67f_86eb00ae4e8941ffa1b97e1582c2aebf.pdf
    • https://static.usrfiles.com/ugd/b7ab08_641dc04b39414af6a03dabe5c7242ebc.pdf
    • https://static.usrfiles.com/ugd/3b0c81_c4bc9430fc8b40f19d1f4b41af814c89.pdf
    • https://static.usrfiles.com/ugd/9ea9b6_321e0dd8fb1947d890a3862b65e7da22.pdf
    • https://static.usrfiles.com/ugd/4cfbbd_2a54382a85f84398afb944acf91b586e.pdf
    • https://cdn.shopify.com/s/files/1/0434/1301/2636/files/16623767636.pdf
    • https://cdn.shopify.com/s/files/1/0438/1612/4576/files/bubba_gump_shrimp_menu.pdf
    • https://cdn.shopify.com/s/files/1/0438/6793/0789/files/edexcel_ial_chemistry_data_booklet.pdf
    • https://cdn.shopify.com/s/files/1/0434/3414/7989/files/xonejel.pdf
    • https://cdn.shopify.com/s/files/1/0437/8440/5153/files/77249598193.pdf
    • https://cdn.shopify.com/s/files/1/0432/2577/6288/files/renai_circulation_sheet_music_violin.pdf
    • https://cdn.shopify.com/s/files/1/0436/6221/3270/files/free_convert_to_fillable_form.pdf
    • https://cdn.shopify.com/s/files/1/0438/8909/8907/files/28451397268.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_off0000811a.bin
fd15f8d0122dbb0e02dcdce28c29f60ebb9627edded1e2fd79f1e7de7e931d1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x811A 5224 bytes
font_01_sfnt_off000092f4.bin
483c249186c520948b89fc88d993b384f45c757583bc743b3005f2d4f4423a40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92F4 10436 bytes

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