Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26a8ad226f22b67…

MALICIOUS

PDF

41.0 KB Created: 2020-08-22 03:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0564573fcf08c5bc4a495c8aa102bdeb SHA-1: 0a7012db980564af33b4c968fbdcfd86919a02cf SHA-256: f26a8ad226f22b67cde49e81174fd626be466d2c3303fc87a95a35674f47bdda
150 Risk Score

Malware Insights

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

The PDF file exhibits malicious behavior through a link farm, as indicated by the PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics. The primary malicious URL, https://ttraff.com/pify?keyword=associa%25C3%25A7%25C3%25A3o+brasileira+de+normas+t%25C3%25A9cnicas+pdf, is a redirector. The document body contains a mix of garbled text and URLs, further supporting the link farm and redirection attack pattern. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=associa%25C3%25A7%25C3%25A3o+brasileira+de+normas+t%25C3%25A9cnicas+pdf
    • http://rulefife.caitlin-cannon.com/uploads/1/3/0/8/130874368/735b392217b3.pdf
    • https://cdn.shopify.com/s/files/1/0431/4474/1024/files/zetotugik.pdf
    • https://cdn.shopify.com/s/files/1/0435/4310/1591/files/39770800637.pdf
    • https://cdn.shopify.com/s/files/1/0439/0685/9176/files/camerafi_live_free_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0460/9975/9268/files/witad.pdf
    • https://cdn.shopify.com/s/files/1/0432/3888/3495/files/avast_antivirus_offline.pdf
    • https://cdn.shopify.com/s/files/1/0430/8431/6823/files/plan_b_candy_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0434/4528/9127/files/tonemesagewoduz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/52325197595.pdf
    • https://cdn.shopify.com/s/files/1/0432/4848/4507/files/99864173943.pdf
    • https://cdn.shopify.com/s/files/1/0447/5266/6778/files/mass_moment_of_inertia_derivations.pdf
    • https://cdn.shopify.com/s/files/1/0437/8948/4189/files/gabuxi.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_off00005d6e.bin
e599646ba5ab3f6af009eb2108d0e65c2d0c2eca28944d7e0ff0421b3ec591e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D6E 6072 bytes
font_01_sfnt_off000070cf.bin
f92edb14c979f938ce5739fb41c14a73d8af7fef68b36f914e9cc490c246274a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70CF 11840 bytes

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