Malicious PDF — malware analysis report

Static analysis result for SHA-256 ead2eca98c5b60cf…

MALICIOUS

PDF

40.3 KB Created: 2020-09-02 23:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1d8ca599682005bcbc44aae683c3930 SHA-1: 3f40a585a2c17d9637cc4e1a3618e4e6ff948e6e SHA-256: ead2eca98c5b60cf3eb7c54b5aacd6918bcac7fcf096511c2e5ec500240328c7
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.link/wix?keyword=letter+o+worksheet+preschool'. This URL is designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains references to this URL and other PDF links, suggesting a link farm or redirection strategy. The ML classifier also 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.link/wix?keyword=letter+o+worksheet+preschool
    • https://static.usrfiles.com/ugd/b8c837_83ed7fecf43645cf9dda821df40c48f0.pdf
    • https://static.usrfiles.com/ugd/0047a4_08c74d2d4d424b23af601afed59bced5.pdf
    • https://static.usrfiles.com/ugd/1fa6dd_dfb47d32ea7c473b9d9f8c9702156b55.pdf
    • https://static.usrfiles.com/ugd/b8c837_1184f9f3fe86435aa291defcad351a0d.pdf
    • https://cdn.shopify.com/s/files/1/0438/4541/9165/files/design_of_machinery.pdf
    • https://cdn.shopify.com/s/files/1/0437/0015/8629/files/61085429077.pdf
    • https://static.usrfiles.com/ugd/b8c837_394a5068d7e449e1b1c9c88527e82da4.pdf
    • https://static.usrfiles.com/ugd/ab63e3_6da2f8b5081c4bdd80b013b8bcaacc89.pdf
    • https://static.usrfiles.com/ugd/145364_2a96517e2eff44ad9f8e29e385fdc251.pdf
    • https://cdn.shopify.com/s/files/1/0429/8699/5863/files/bls_book_aha.pdf
    • https://cdn.shopify.com/s/files/1/0436/3767/0041/files/libew.pdf
    • https://cdn.shopify.com/s/files/1/0435/6987/3054/files/egypt_pyramids_travel_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/1097/3083/files/sebaj.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_off000060df.bin
cbf641894dd8948d0e754f5620b6b887405d335033585f6008c4ea51612efe07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60DF 4908 bytes
font_01_sfnt_off000071ab.bin
3de7774f26bc62bb8e9caff5e23dd57f34077661599b5ae125c8fd3cf7c0ee99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71AB 10192 bytes

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