Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa850ba9840856e…

MALICIOUS

PDF

50.2 KB Created: 2020-08-17 01:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b7df52459aa3226ddbc7f43d7d041de SHA-1: 73105b4dd2aae89f249089bd3b3e3e8125f97d9e SHA-256: 3aa850ba9840856eb1655a7f26e46fa9bc573a80b1eb0dea880108f3c93e17d0
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting a lure for '3d cad files free' and the URL 'https://ttraff.cc/pify?keyword=3d+cad+files+free' is present, confirming the redirection attempt. The presence of a large number of external PDF links also suggests a link farm or SEO poisoning tactic.

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.cc/pify?keyword=3d+cad+files+free
    • http://files.puellarumacademy.com/uploads/1/3/0/7/130776728/fozadefuxizime_bavuxixigaf_fisututekedaz.pdf
    • http://files.karrathacaravanpark.com.au/uploads/1/3/0/7/130775730/lozipulub.pdf
    • https://cdn.shopify.com/s/files/1/0434/0400/1443/files/antioxidantes_endgenos.pdf
    • https://cdn.shopify.com/s/files/1/0434/1517/5335/files/kazowamom.pdf
    • https://cdn.shopify.com/s/files/1/0434/5040/0928/files/43514089156.pdf
    • https://cdn.shopify.com/s/files/1/0431/0463/2998/files/79367859460.pdf
    • https://cdn.shopify.com/s/files/1/0435/2271/9912/files/fulepeziv.pdf
    • https://cdn.shopify.com/s/files/1/0430/0147/9321/files/ritogun.pdf
    • https://cdn.shopify.com/s/files/1/0437/1329/8581/files/guadalajara_cardiologia_8_edicion.pdf
    • https://cdn.shopify.com/s/files/1/0433/6310/6968/files/fatufivuven.pdf
    • https://cdn.shopify.com/s/files/1/0441/1742/6328/files/decameron_boccaccio_italiano.pdf
    • https://cdn.shopify.com/s/files/1/0437/5203/0357/files/64408182345.pdf
    • https://cdn.shopify.com/s/files/1/0430/9155/8551/files/ds2_cheat_engine_table.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_off000086c6.bin
a3560950af5c04556e557248186a82310f057c51bafa964d46201b7eb119c7ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86C6 5084 bytes
font_01_sfnt_off00009809.bin
be2bf840901868e660794d56153b788e5e5b32365a8db0ef071c95242c305128		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9809 10700 bytes

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