Malicious PDF — malware analysis report

Static analysis result for SHA-256 34791833dec0e0da…

MALICIOUS

PDF

41.6 KB Created: 2020-09-02 01:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b63dfccccf33f2e276c7e613238cd5a5 SHA-1: bbd324df4c01d940adfb41dc71248f6dbc3bcd0e SHA-256: 34791833dec0e0da1f4edfeb3ec3faf0cc2d3e8d616314417d2ab3e4b600dd03
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 'https://ttraff.com/wix?keyword=cbest+math+practice+test+2018+pdf'. This indicates the document is designed to lure users to a malicious site. The PDF also contains a large number of external links, many hosted on cdn.shopify.com, suggesting a link farm for SEO poisoning or distribution. The ML classifier strongly flagged this PDF as malicious.

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=cbest+math+practice+test+2018+pdf
    • https://static.usrfiles.com/ugd/9dda13_97f3b91f7c9a42a7a69d992e26c6ce7b.pdf
    • https://static.usrfiles.com/ugd/b8c837_7656779f324e42e1b8aa0d9c175873b1.pdf
    • https://static.usrfiles.com/ugd/81ef4b_ad728cede77343f2a971ff4f6ab40180.pdf
    • https://static.usrfiles.com/ugd/b8c837_00b0f315ce69400b92392478d17f8673.pdf
    • https://cdn.shopify.com/s/files/1/0431/6977/5782/files/37594130769.pdf
    • https://cdn.shopify.com/s/files/1/0433/9833/2565/files/dedojak.pdf
    • https://cdn.shopify.com/s/files/1/0435/7593/5135/files/sugiludazadesuxidoveduf.pdf
    • https://cdn.shopify.com/s/files/1/0437/4816/3733/files/cursive_writing_worksheets_ks1.pdf
    • https://cdn.shopify.com/s/files/1/0431/1715/0368/files/1956282508.pdf
    • https://cdn.shopify.com/s/files/1/0429/5737/3589/files/tiwupe.pdf
    • https://cdn.shopify.com/s/files/1/0433/1651/0873/files/90596546794.pdf
    • https://cdn.shopify.com/s/files/1/0432/7840/1700/files/vezevujojixikukizeri.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_off0000618b.bin
df3afec6b3611ff944e97a9116b8921fc2f9d8cf862065f6fa7bea92ac4a6a10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x618B 5928 bytes
font_01_sfnt_off00007581.bin
46933256315277bba9b7f9ca5068747ad9f294fb70a996c34f123c7a1f2917ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7581 10652 bytes

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