Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd5c5f291a25d503…

MALICIOUS

PDF

56.4 KB Created: 2020-08-30 23:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aac55ae776eea38d92f80a86ca332b40 SHA-1: 7eae376d03dc3139b7d4439fcd6781dc0fa49968 SHA-256: dd5c5f291a25d5038aab0f5bf05c6bcdfdad3aa2e1aac8678d4fa6ef8c76bab1
150 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The presence of a link farm further suggests an intent to distribute malicious content or conduct phishing operations.

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.cc/wix?keyword=ejercicios+resueltos+prestamos+metod
    • https://static.usrfiles.com/ugd/0c8cc8_eb93aff95155492ebc8b8a7ccb32eef6.pdf
    • https://static.usrfiles.com/ugd/76b6de_5ee27193678d4e2b84f12d822997e6b0.pdf
    • https://static.usrfiles.com/ugd/5af86b_2859b646a54043faa3781ffea35a4c3b.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f28f964dfbd4c9dbd9f1f6acb0820fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_7abbe3ac97e94446a9a8ad4482f93da4.pdf
    • https://static.usrfiles.com/ugd/b8c837_c68e448a9dff4b0caa2b20c150e57978.pdf
    • https://static.usrfiles.com/ugd/b8c837_fcd7010f44864e0495c381b9c7c8127f.pdf
    • https://static.usrfiles.com/ugd/b8c837_4e20110fd41f4636b6ca4aa6395a8683.pdf
    • https://static.usrfiles.com/ugd/b8c837_9878380b4589458a9e397987f4a737ac.pdf
    • https://static.usrfiles.com/ugd/b8c837_4e7b5ca34de4477683cca469eae79e17.pdf
    • https://static.usrfiles.com/ugd/e643da_a7e40c85bc514231a0d6b533038e036b.pdf
    • https://static.usrfiles.com/ugd/a771bd_7063a86c1a4042ac9d674182f6404d0e.pdf
    • https://static.usrfiles.com/ugd/2e16aa_1cedc2d923694ed5a79fd9ebb52f6664.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_off0000923a.bin
2a4ea601fd8dcb3f833fab952d9ea65b73bc11e179a03be3151a74a235488a0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x923A 5252 bytes
font_01_sfnt_off0000a3fb.bin
9fe5944f9702bb92d8a5ec6dac8a507c1e6f9cb23d8775663160c64241db3746		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3FB 16024 bytes

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