Malicious PDF — malware analysis report

Static analysis result for SHA-256 82dff9485bc60378…

MALICIOUS

PDF

36.1 KB Created: 2020-08-31 19:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b837f876e51feb0fc01e0cb005177ad2 SHA-1: b66b03d373d614f61954d59a47c6c12be08bbb4d SHA-256: 82dff9485bc60378c5a2e7e2c2f498f68ec17c2b7af216b0edfaf87bf55479c9
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 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to external PDFs, many hosted on Shopify. The document body, though heavily obfuscated, contains the malicious URL. The primary attack pattern involves luring users to a malicious redirector disguised as an educational worksheet.

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=aztec+empire+map+worksheet
    • https://cdn.shopify.com/s/files/1/0436/9799/5941/files/kozevorebojorupufakojani.pdf
    • https://cdn.shopify.com/s/files/1/0435/4614/9023/files/verbe_tre_et_avoir_en_anglais.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0719/files/treated_wood_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0431/8203/1007/files/newborn_baby_app_android.pdf
    • https://cdn.shopify.com/s/files/1/0434/5505/3989/files/55515477027.pdf
    • https://cdn.shopify.com/s/files/1/0433/8660/1635/files/anaemia_disease.pdf
    • https://cdn.shopify.com/s/files/1/0436/5592/1817/files/18988595866.pdf
    • https://static.usrfiles.com/ugd/f96b02_7416c2bfab724a3ba9a4851e146849cd.pdf
    • https://static.usrfiles.com/ugd/b8c837_04fd5bf03790481d90c5636122a43b25.pdf
    • https://static.usrfiles.com/ugd/ae15ca_98e7c5941fce4c078046f7c40fafad51.pdf
    • https://static.usrfiles.com/ugd/edb4a7_b340a1ba748644deab205cb2ca1941ab.pdf
    • https://cdn.shopify.com/s/files/1/0432/7879/4920/files/organismal_ecology.pdf
    • https://cdn.shopify.com/s/files/1/0428/2597/3916/files/34431965749.pdf
    • https://cdn.shopify.com/s/files/1/0433/6674/4214/files/gazufavamirexe.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_off000043b4.bin
dd1baf7f3bd4f0d9ee313c0260a3c0860d512541941c692daa6599fbd994f360		 pdf-font-stream PDF embedded font (sfnt) at offset 0x43B4 5016 bytes
font_01_sfnt_off000054cf.bin
1ff6247a1504fac2abee8eb62639b53f5fbe2b688c9d67c94a096b6e15b8b5a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54CF 9628 bytes
font_02_sfnt_off000075a3.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75A3 4324 bytes

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