Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc81af47a6b4b27…

MALICIOUS

PDF

43.1 KB Created: 2020-08-29 18:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82240a62c717f48e8cd0b44008ec1cec SHA-1: 1dbb76f82ebc6cd2e3e1eca59e593b7a13421c1c SHA-256: 4bc81af47a6b4b279982ce9b7e71394e04e98ee904ad7502d8fc5bdaf6aa77e9
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 a critical heuristic firing indicating a PDF link farm. One of the primary links directs to a known malicious redirector, ttraff.ru, which is likely used to obscure the final malicious destination. The document body is heavily obfuscated and contains what appears to be junk data, further suggesting a malicious intent rather than legitimate content.

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=borderlands+3+flakker
    • https://static.usrfiles.com/ugd/b8c837_a41ee739c4c04b99ab9cfd73163e7638.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7112932bd574c32bcf9b88ad9cab949.pdf
    • https://static.usrfiles.com/ugd/b8c837_56c69a133a9e4447b6721566e63020f2.pdf
    • https://static.usrfiles.com/ugd/b8c837_ba385a38c96a47f6959ba425c99e3d8d.pdf
    • https://cdn.shopify.com/s/files/1/0433/5425/9606/files/xapakepi.pdf
    • https://cdn.shopify.com/s/files/1/0462/6566/3642/files/free_printable_mailing_labels_templates.pdf
    • https://cdn.shopify.com/s/files/1/0453/8872/6440/files/23159012874.pdf
    • https://cdn.shopify.com/s/files/1/0436/1594/4867/files/canon_in_d_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0439/0522/0763/files/tipos_de_nylamid.pdf
    • https://static.usrfiles.com/ugd/b8c837_1aaf8e732ebf43249cdee28f20905d00.pdf
    • https://static.usrfiles.com/ugd/4d6844_8bd0ed24428d472b8b3cb36fff4722f4.pdf
    • https://static.usrfiles.com/ugd/67f5f7_75d953b004b74372a83d8ef2950ce085.pdf
    • https://static.usrfiles.com/ugd/b8c837_e86b580fbe8349aa9d21162d22d7c94f.pdf
    • https://static.usrfiles.com/ugd/b8c837_0ad5dce24a5841b0bfda3ac696c1c899.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ad9b255d5cf4ba5b5ac3a68487226bd.pdf
    • https://static.usrfiles.com/ugd/b8c837_693ee6fde0234f50981d66cb7a8eb40f.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_off0000690b.bin
aff98e4c57ab9322501acb9c24cefa6ef6c3af6e7abe68ef69150edaeca85c76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x690B 5180 bytes
font_01_sfnt_off00007ab4.bin
37c2f3959a1cecb2916247857af4a1acf3c02d7a9bd5e34d50b8939260fcae9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB4 10832 bytes

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