Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a9b78a7bb50cc31…

MALICIOUS

PDF

53.0 KB Created: 2020-08-30 00:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03905616ca4fa4dd57aa489978cd283d SHA-1: bf20405f5a24ef2cd726f5357b562977775a4324 SHA-256: 9a9b78a7bb50cc316661c47af3a512eb0e260bb0e02fe1769443aaa600f08e89
128 Risk Score

Malware Insights

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

The PDF contains a mass external link farm and a critical heuristic firing for a malicious redirector. The embedded URL 'https://ttraff.cc/wix?keyword=spanish+conjugation+pdf' is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL, suggesting it's the primary lure. The presence of a 'download button' heuristic further supports the social engineering aspect.

Heuristics 4

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=spanish+conjugation+pdf
    • https://static.usrfiles.com/ugd/b8c837_b0aabbc553d042b99877955f06c725cc.pdf
    • https://static.usrfiles.com/ugd/6f53d7_e1cfb84d5e34422a9a318f4d6e7a8e4d.pdf
    • https://static.usrfiles.com/ugd/b8c837_ae1002feafd14e38a9b8b3d76a79c158.pdf
    • https://static.usrfiles.com/ugd/97aff7_0357f42c58c243fd8ca1be429cb0a9c8.pdf
    • https://static.usrfiles.com/ugd/0286dd_bdd6bf52077d4a6aaa10c43835eb523b.pdf
    • https://static.usrfiles.com/ugd/6240f8_bdbe9c16a13d45018ed1a5a7c6bc414e.pdf
    • https://static.usrfiles.com/ugd/0049ca_6c1619d7305f4c8093526bdc2cbc151f.pdf
    • https://static.usrfiles.com/ugd/b8c837_19743b1132eb45f6b0371d2cb1007d30.pdf
    • https://static.usrfiles.com/ugd/067ecb_95a25567a62b419283153219d0423da6.pdf
    • https://cdn.shopify.com/s/files/1/0439/9307/1774/files/jubuvinefakobosa.pdf
    • https://cdn.shopify.com/s/files/1/0432/7813/9556/files/pdf_to_word_download_for_pc.pdf
    • https://static.usrfiles.com/ugd/b8c837_40b0e2f330ed48b687c04fd0fa65e47c.pdf
    • https://static.usrfiles.com/ugd/26481d_1d37cbd4c2364bc38b1a621158390b7d.pdf
    • https://static.usrfiles.com/ugd/6924eb_bc527196f62f433f85bb8932c9b72fc9.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_off00008702.bin
1c61d7a99434a81181b9a003e96bc2a0af9050ec8e154d3281d2e7d99f189868		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8702 5468 bytes
font_01_sfnt_off0000998f.bin
b68ad9764a39869035c7c48b7d8b51e131bae721bcb9ad615fcb3f95c91ffc5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x998F 14668 bytes

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