Malicious PDF — malware analysis report

Static analysis result for SHA-256 3892e63a2384433c…

MALICIOUS

PDF

53.4 KB Created: 2020-08-30 23:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7af4565612dcb983d9f2599de40857b SHA-1: 573f1378978a7597aac15785d6e666e5c63a2362 SHA-256: 3892e63a2384433cb5884595902b6f2ac1de04b14693713938d0eb0f63c67d43
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=equa%25C3%25A7%25C3%25B5es+literais+exercici'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links to external PDFs, many hosted on 'static.usrfiles.com'. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same suspicious URL, reinforcing the lure. The primary intent appears to be redirecting the user to malicious infrastructure.

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=equa%25C3%25A7%25C3%25B5es+literais+exercici
    • https://static.usrfiles.com/ugd/b8c837_3b85c4984ff244058e65dd367f31e851.pdf
    • https://static.usrfiles.com/ugd/b8c837_ebf6d88b415d42968b2774fa6922d76d.pdf
    • https://static.usrfiles.com/ugd/cc10e7_6a863dc2bfc047c9b64d495f31174f14.pdf
    • https://static.usrfiles.com/ugd/f0f215_65921ab551c24b7696d6d98ca6e1dd9c.pdf
    • https://static.usrfiles.com/ugd/b8c837_c207b765a0f34def87e54e84cc07233c.pdf
    • https://static.usrfiles.com/ugd/e2c250_8b63ef52176c46639c705f8cfce7607a.pdf
    • https://static.usrfiles.com/ugd/e4a001_897725adbaf840308ae12a076ae9d5d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_c59dde0f4c0644d98e617d6170bb45ed.pdf
    • https://static.usrfiles.com/ugd/b8c837_4cc8873b958a4a1c8d8e764c90605f5b.pdf
    • https://static.usrfiles.com/ugd/ee4a13_4732229d9fc24f16af955e717565877d.pdf
    • https://static.usrfiles.com/ugd/19ce5d_9313b547fead4467848002cad2d88d8c.pdf
    • https://static.usrfiles.com/ugd/0c4177_e16aaa82f42d485ba8759d1f55a01d52.pdf
    • https://static.usrfiles.com/ugd/b8c837_4493b3712e744fbdae29f68889328556.pdf
    • https://static.usrfiles.com/ugd/b8c837_02fdf7ef2b034ecda35f0a51f9c8da88.pdf
    • https://cdn.shopify.com/s/files/1/0437/4921/2311/files/kisagejewipamebadipi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0665/5642/files/ripaxujulizolasifito.pdf
    • https://cdn.shopify.com/s/files/1/0435/6797/2513/files/sezekamupabepogas.pdf
    • https://cdn.shopify.com/s/files/1/0440/8383/9128/files/76391931667.pdf
    • https://cdn.shopify.com/s/files/1/0449/5409/1675/files/wizard101_sign_up.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00009ade.bin
11f352475dca1f40c8aa965bbffe33c097091dd4557b3f101573546459ef8f05		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9ADE 18448 bytes
font_00_sfnt_off000062c8.bin
e1d2a24a3afabc50007194580d4f4a812ae5909d746beff0f324a652b3d4a3b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62C8 5012 bytes
font_01_sfnt_off000073a3.bin
2842b56f0040700c8607e1f5af9fd32cd6cdbd1ffdd31ee2338fce8e51188028		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73A3 12840 bytes
font_03_sfnt_off0000b7e5.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E5 4324 bytes

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