Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae5bf579315ac5a…

MALICIOUS

PDF

41.2 KB Created: 2020-08-29 16:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67b0abba6b108a4e46a274ceaf01a719 SHA-1: da106c2e6a2c6cf8afb022ef7d7bff9d9f76cf97 SHA-256: aae5bf579315ac5a306417b77901a76543960f96090722547f4e3cfe61a3b0c5
120 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one heuristic specifically identifying it as a 'PDF SEO Link Farm'. The primary malicious link directs to a redirector URL, suggesting an attempt to obscure the final destination. The document body itself is largely obfuscated but contains the same redirector URL and a large number of other PDF links, reinforcing the link farm detection.

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.me/wix?keyword=fossilization+in+second+language+acquisition
    • https://cdn.shopify.com/s/files/1/0431/3507/4465/files/kabujojokesanubip.pdf
    • https://cdn.shopify.com/s/files/1/0431/7623/1063/files/74690278116.pdf
    • https://cdn.shopify.com/s/files/1/0433/5743/8101/files/academic_ielts_task_1.pdf
    • https://cdn.shopify.com/s/files/1/0439/8927/0686/files/video_er_android_1.pdf
    • https://static.usrfiles.com/ugd/b8c837_c840536c587b45b294d99a09c57bb893.pdf
    • https://static.usrfiles.com/ugd/b8c837_ff2d22fbe6914aa282fe92476a059cad.pdf
    • https://static.usrfiles.com/ugd/b8c837_b8aad556fdf04239a4a20cfb2279dd52.pdf
    • https://cdn.shopify.com/s/files/1/0435/8481/5263/files/online_converting_word_document_to.pdf
    • https://cdn.shopify.com/s/files/1/0435/0319/0181/files/91373429562.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_off000063a4.bin
02544b13482d2739d5d0c9fe6aa4f93fd4c580bc2c0bff4fc159235710f0370a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63A4 5144 bytes
font_01_sfnt_off0000752f.bin
46e3132b2a9e2ae19780c3aba328ef35ad290c077f080f23322f1b61f56484e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x752F 10304 bytes

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