Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b66562cb8b51087…

MALICIOUS

PDF

45.9 KB Created: 2020-08-29 17:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0641c6a7bc97f698050fb0737e6cae43 SHA-1: 87395e52f08b9b19d47094140b4f6675c969aad9 SHA-256: 3b66562cb8b510870f0aee5cfc3685b6b9ba05724deb40839fe0ebe2da87f31e
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The primary malicious URL identified is https://ttraff.ru/wix?keyword=ratas+en+las+paredes+kobayashi, which is likely used to redirect users to a malicious site. The document body contains garbled text but also includes the same malicious URL and a benign-looking PDF URL, suggesting an attempt to disguise malicious intent. The ML classifier also strongly indicated maliciousness.

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.ru/wix?keyword=ratas+en+las+paredes+kobayashi
    • https://static.usrfiles.com/ugd/b8c837_54acd1b4359e40bab030e4b644c34145.pdf
    • https://static.usrfiles.com/ugd/b8c837_64679c48eee6424bac4ab83588e1050b.pdf
    • https://static.usrfiles.com/ugd/136d07_1582f75d151f4986883d95326977a604.pdf
    • https://static.usrfiles.com/ugd/b8c837_3011a4f3a1d545b59a2c0ab3f6444fef.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e80665ef6384bfc964a23d98fabaa1c.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1160/files/sadatifilopukifedib.pdf
    • https://cdn.shopify.com/s/files/1/0427/8140/9436/files/33398020885.pdf
    • https://cdn.shopify.com/s/files/1/0430/3519/7602/files/jk_skyrim_lite.pdf
    • https://cdn.shopify.com/s/files/1/0428/0057/8723/files/flange_bolt_size_chart.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1369814796.pdf
    • https://cdn.shopify.com/s/files/1/0431/6204/2532/files/lusogebo.pdf
    • https://cdn.shopify.com/s/files/1/0427/7541/2902/files/33480388832.pdf
    • https://static.usrfiles.com/ugd/b8c837_4c7e713feac942cc815220b9f6045148.pdf
    • https://static.usrfiles.com/ugd/b8c837_255cab9218ea446897b28ca64baf0d1b.pdf
    • https://static.usrfiles.com/ugd/b8c837_976822f605494c2280f25cbafcfbd61d.pdf
    • https://static.usrfiles.com/ugd/b8c837_7edd44ac085d4c6fa20bd1fb0a4a616f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000646f.bin
2f9e1d79f9aa0d12455b4ba95d6ea26a8b40a9494e28eaf34a41193c3aac446c
pdf-font-stream PDF embedded font (sfnt) at offset 0x646F 5148 bytes
font_01_sfnt_off000075e2.bin
8e9d287e33c0fd89bb3f08271aa1f11f8b2645dee612e49db25122a672e4a844
pdf-font-stream PDF embedded font (sfnt) at offset 0x75E2 11408 bytes
font_02_sfnt_off00009b37.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B37 4324 bytes