Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec00806a02879c60…

MALICIOUS

PDF

40.6 KB Created: 2020-09-01 03:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab7fdaa43c7be61c9c60e94716467cc2 SHA-1: a8e71f49a1a9ccf606c3701e7f7fdd0db061c076 SHA-256: ec00806a02879c60b703488151e930c6df580e7df70fc4d3f18de2a612d4b61c
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/wix?keyword=punctuation+worksheets+for+6th+grade+free'. It also exhibits characteristics of a PDF link farm, with numerous external links. The document body, though heavily obfuscated, contains the same URL, suggesting a lure to download further content. 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.ru/wix?keyword=punctuation+worksheets+for+6th+grade+free
    • https://static.usrfiles.com/ugd/516793_2e9187187fd34739a699780cbd83e335.pdf
    • https://static.usrfiles.com/ugd/0d089b_684e81ad214442fea3a94aae930af434.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_40f782ebdaa64210ac171f1fff52dc29.pdf
    • https://cdn.shopify.com/s/files/1/0431/4093/9933/files/dodejusotokibatipeteramo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4077/6093/files/siravowojojugasele.pdf
    • https://cdn.shopify.com/s/files/1/0441/0572/8152/files/gedirowokurekesinujiji.pdf
    • https://cdn.shopify.com/s/files/1/0435/8357/0083/files/nirolaseboxegeme.pdf
    • https://cdn.shopify.com/s/files/1/0454/5177/2056/files/21623476321.pdf
    • https://cdn.shopify.com/s/files/1/0434/4496/1436/files/rimano.pdf
    • https://static.usrfiles.com/ugd/0c8cc8_814541f4625e4b18b6f4162c87a0ed1f.pdf
    • https://static.usrfiles.com/ugd/79e0dc_a2c64fa7f1c44d7ea2e709cd23882a35.pdf
    • https://static.usrfiles.com/ugd/b91566_99d2adee591b4111b1d6f613e3fc4c6e.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_off00006052.bin
3b9e3812a32d4ee1a856936d40299f9617abc231197f82fb2bcb1206f8d8fb32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6052 5560 bytes
font_01_sfnt_off00007350.bin
be6fd5c78b1486ad0f6efa29232161893aec395fe4bcb53962ef03841a9ada75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7350 10044 bytes

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