Malicious PDF — malware analysis report

Static analysis result for SHA-256 e536200d45616931…

MALICIOUS

PDF

44.2 KB Created: 2020-08-31 12:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 075a5d2ccc546391bbb8bbe809e0f289 SHA-1: 7aa0ccefa6d2725c807033d90f42c2abdf0344ae SHA-256: e536200d4561693134e85bd69ee388d240da31eb21bfd95573ab2a25834ba265
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/wix?keyword=gantt+chart+excel+2010'. It also exhibits characteristics of a PDF link farm, with numerous links to external PDFs, many hosted on static.usrfiles.com. The document body, though heavily obfuscated, contains the malicious URL and references to Gantt charts and Excel, suggesting a lure to trick users into clicking the malicious link. The ML classifier strongly indicates maliciousness.

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.com/wix?keyword=gantt+chart+excel+2010
    • https://cdn.shopify.com/s/files/1/0430/0315/0499/files/repidasoz.pdf
    • https://cdn.shopify.com/s/files/1/0436/5778/9593/files/bupevoloxavebifurerufo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0952/3355/files/89879731039.pdf
    • https://cdn.shopify.com/s/files/1/0434/0000/3751/files/chemistry_chart_periodic_table.pdf
    • https://cdn.shopify.com/s/files/1/0434/3952/1959/files/ascensores_otis_catalogo.pdf
    • https://static.usrfiles.com/ugd/b50c55_4f7b2fb4ee6c44cea947c943f2493d91.pdf
    • https://static.usrfiles.com/ugd/6c032c_d8269a42aea34ef983b627f2d6e3c597.pdf
    • https://static.usrfiles.com/ugd/b8c837_c8b5fbe519dd4d489f77557477427c74.pdf
    • https://static.usrfiles.com/ugd/33a2e4_da460b1d3d474caa9c1071920af5c78a.pdf
    • https://static.usrfiles.com/ugd/87fdc7_ca5c08472ac54205bcb55b50ee4fbc51.pdf
    • https://static.usrfiles.com/ugd/68ec51_64d32e09f166475da72713c91bbcd07e.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006394.bin
1b0b6bb02476175c11b131f54b3065322646ac474f581be850b3844ec3abeaf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6394 4764 bytes
font_01_sfnt_off000073b9.bin
13c6744e490dcd30ccc42762757dacf3a87e2d418517a44fe7468900b17bd1d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73B9 10160 bytes
font_02_sfnt_off0000966e.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x966E 4324 bytes

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