Malicious PDF — malware analysis report

Static analysis result for SHA-256 af1fdef264b4c9bf…

MALICIOUS

PDF

121.6 KB Created: 2020-08-30 18:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 424c8c9891de10707161e28dbd50cd17 SHA-1: a664ba8f13a3bc755d43c4b7931b98265a84ef6e SHA-256: af1fdef264b4c9bf2e41a0d282266846983a8fe476684fa3026f05cf1d580dd7
120 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.com', which is disguised as a 'touchstone 3 workbook answer key'. This suggests a phishing or malware delivery attempt. The document also contains a large number of embedded links, many pointing to Shopify, which is characteristic of SEO link farm abuse to improve search engine ranking for malicious content. No scripts were extracted from this sample.

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=touchstone+3+workbook+answer+key+uni
    • https://cdn.shopify.com/s/files/1/0468/1347/9066/files/ffxiv_rdm_stat_priority.pdf
    • https://cdn.shopify.com/s/files/1/0428/6450/9094/files/free_templates_for_brochures.pdf
    • https://cdn.shopify.com/s/files/1/0440/2275/9582/files/dufajuvudigofo.pdf
    • https://static.usrfiles.com/ugd/cafc24_326656543eea45858e860fcec5ed9050.pdf
    • https://static.usrfiles.com/ugd/f7fbc8_97e1f5fc205d43fbabbd4d34a810769f.pdf
    • https://static.usrfiles.com/ugd/7ff653_09f493f6abbe418ea813c6784b9a40a5.pdf
    • https://static.usrfiles.com/ugd/ca32a8_83587e39bc7943d6b7c9422ef4a374db.pdf
    • https://static.usrfiles.com/ugd/b8c837_7ad9077bb1ae479a94ef372cc60da741.pdf
    • https://static.usrfiles.com/ugd/ecec20_b9e5b4e5610f4ef3906db2a017fe6570.pdf
    • https://static.usrfiles.com/ugd/9ea9b6_6be018737efb44df973ec5e83cef4932.pdf
    • https://static.usrfiles.com/ugd/83e24f_baf10d64cd70418d96032d8a9d0f4e3d.pdf
    • https://static.usrfiles.com/ugd/23b571_bafdb7a798bc431584aff52c38053f98.pdf
    • https://static.usrfiles.com/ugd/83f04e_7695de20d6324c0287df902c6b440a3b.pdf
    • https://static.usrfiles.com/ugd/ce5d00_e26715f998bc49fd8c6169400094f187.pdf
    • https://static.usrfiles.com/ugd/162fe6_6d24d03996a5486d90db9276b8bcb59d.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_off00019314.bin
a5625e9bda5ad579409c00ff572939cff498ede81072912eff5deb9c52e5d7af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19314 5368 bytes
font_01_sfnt_off0001a55e.bin
ea828abd4af4890acfd1a740a2e51a061e9a484047195c73f072c0646196eaa3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A55E 16408 bytes

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