Malicious PDF — malware analysis report

Static analysis result for SHA-256 b90d848ca4109903…

MALICIOUS

PDF

39.7 KB Created: 2020-08-31 09:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e67cdb4e5d77e5db35a0dc91216b463 SHA-1: 49a6c15629f133a2fdb533898aea465c08605ff3 SHA-256: b90d848ca410990398c4426eb7aa232459b215ab1b3c7bb4d093ce09ed36cf59
120 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to its inclusion of a link farm. The primary heuristic indicates a PDF redirector link pointing to 'ttraff.com', which is known malicious infrastructure. Additionally, the file contains numerous embedded links to PDFs hosted on 'static.usrfiles.com', suggesting a coordinated effort to distribute content or lure users. The document body, though heavily obfuscated, contains the malicious URL, reinforcing the attack pattern.

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/wix?keyword=notas+del+acordeon+de+botones
    • https://static.usrfiles.com/ugd/daca0d_dec94e53cf6045308a702428ed55caa7.pdf
    • https://static.usrfiles.com/ugd/2813e2_d0fd893403254e6a9c8be4a2e44fd591.pdf
    • https://static.usrfiles.com/ugd/b8c837_4700affa9b294b6ab96056e667ff6845.pdf
    • https://static.usrfiles.com/ugd/e4ff69_088e598ae2b1421086ead9ab2bca99a0.pdf
    • https://static.usrfiles.com/ugd/aef5b7_ff0cdf795fed493fb8dc7461caea714a.pdf
    • https://static.usrfiles.com/ugd/63022f_609363e0586a4a41b5f4b7971dbc2908.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9354/files/find_the_number_halfway_between_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/9656/4131/files/93142930473.pdf
    • https://cdn.shopify.com/s/files/1/0437/2742/1608/files/32915492660.pdf
    • https://static.usrfiles.com/ugd/b8c837_4098010cd0c34d6f9a8e89cd7886b137.pdf
    • https://static.usrfiles.com/ugd/b8c837_d343650d5b8340cc8d85e894b6698886.pdf
    • https://static.usrfiles.com/ugd/e5cbe5_d57ef458791b45d6989946f942331967.pdf
    • https://static.usrfiles.com/ugd/ee4a13_b9edc37db21b4dfb8d5579771447678d.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_off00005c9e.bin
e2c7c967d72af19a0116f1fd2b05b91f6cb55807fdf1c4a80f612f5a69835978		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C9E 5040 bytes
font_01_sfnt_off00006dca.bin
ce81778d1624a3e86e6f11b11b386e79577222620b12941f3726bbb0b5c6dbb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DCA 10784 bytes

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