Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcceec9720dd758d…

MALICIOUS

PDF

60.4 KB Created: 2020-08-31 02:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88076cedbb4d4afe04dba17899dd610f SHA-1: 434d4db96a8b0e577f619661b2b04e4fe80d97eb SHA-256: bcceec9720dd758dbf732af0b32846e4fde0289d6d518d29a9e333b3257e7c21
120 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to its inclusion of a link farm. The primary malicious URL, https://ttraff.ru/wix?keyword=exercicios+sobre+crase+com+gabarito+recanto+das+letras, is a known malicious redirector. The document also contains numerous links to PDFs hosted on static.usrfiles.com, which is indicative of a link farm strategy. The purpose appears to be to lure users to malicious sites through deceptive links.

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=exercicios+sobre+crase+com+gabarito+recanto+das+letras
    • https://static.usrfiles.com/ugd/078c79_1ae5dab1fdd944c6939fb945880bd71e.pdf
    • https://static.usrfiles.com/ugd/a2ebd8_e57efe3d5f7c4d57989861b8396935fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_f5d37feffc15469badd09f3a45dd958d.pdf
    • https://static.usrfiles.com/ugd/9219f8_6aebff9dec9141b3849c1c63f66ee3bf.pdf
    • https://cdn.shopify.com/s/files/1/0437/6684/1505/files/mar_sheet_printable_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/3862/9275/files/ketot.pdf
    • https://cdn.shopify.com/s/files/1/0429/4947/6518/files/gezavegalekotamek.pdf
    • https://static.usrfiles.com/ugd/badafb_2ad9dd2b4d3d4840a746514d3bed1c78.pdf
    • https://static.usrfiles.com/ugd/b8c837_ccdd99dee19742eaaccc7bd74fa3b04f.pdf
    • https://static.usrfiles.com/ugd/b8c837_5def78df6d9a4c24803373e69d6f63c3.pdf
    • https://static.usrfiles.com/ugd/67e251_36808438d54a4e55ae5269eb6603d337.pdf
    • https://static.usrfiles.com/ugd/b916f4_fc34202b9eaa4bc199a25c8524d5fad0.pdf
    • https://static.usrfiles.com/ugd/b910ae_cf48bbcef02e450ea014ebcfab3287d7.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_off0000aa0a.bin
64c1080e1ded8aa8039d6e8774faf9061d15f715892dd0f20f3fd03fdee760e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA0A 5424 bytes
font_01_sfnt_off0000bc5f.bin
eca354a5ef695b1edf9dfb95268355b78fff10bb7d9ea41955e9814d7d755a05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5F 12760 bytes

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