Malicious PDF — malware analysis report

Static analysis result for SHA-256 29ad16a0eb074f07…

MALICIOUS

PDF

43.6 KB Created: 2020-09-01 13:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e159a8708aca70dc9e3c0c88c8ea5d9 SHA-1: b9844ad3df7d2c41c73f5b676499c1f28749b910 SHA-256: 29ad16a0eb074f07e91fcaf6b9d7dafb43a398fb991290b48890d32c43b90e7a
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.club/wix?keyword=google+sheet+sumif+contains+text'. This URL is presented within the document body, disguised as a search result. The PDF also contains a large number of external links, many of which point to benign content, but the primary redirector is clearly malicious. The ML classifier strongly supports the malicious verdict.

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.club/wix?keyword=google+sheet+sumif+contains+text
    • https://static.usrfiles.com/ugd/b8c837_9229c7475ac148419475120c0c0259a5.pdf
    • https://static.usrfiles.com/ugd/eaf48f_d291d9f666e74914b9580536406e93a9.pdf
    • https://static.usrfiles.com/ugd/9cc572_c7a7adfdd00e4615a3e28123cbb224f9.pdf
    • https://static.usrfiles.com/ugd/e5412a_1e269b9f0ac0494bb22e5f0dc4923abc.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b975aed840f46c6a6f75c187cd3bbef.pdf
    • https://cdn.shopify.com/s/files/1/0435/8068/6495/files/79518648299.pdf
    • https://cdn.shopify.com/s/files/1/0434/0485/3406/files/ashrae_handbook_fundamentals_1997.pdf
    • https://cdn.shopify.com/s/files/1/0428/2214/0063/files/most_inspirational_books_of_all_time.pdf
    • https://cdn.shopify.com/s/files/1/0433/2912/6550/files/bedding_sheets_300_thread_count.pdf
    • https://cdn.shopify.com/s/files/1/0434/5665/9617/files/81008660643.pdf
    • https://cdn.shopify.com/s/files/1/0433/7749/2118/files/18720595484.pdf
    • https://cdn.shopify.com/s/files/1/0438/2742/9536/files/sofuki.pdf
    • https://cdn.shopify.com/s/files/1/0434/9945/4628/files/1268325923.pdf
    • https://cdn.shopify.com/s/files/1/0430/0200/3619/files/generic_array_creation.pdf
    • https://cdn.shopify.com/s/files/1/0465/0575/4776/files/error_404_page_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/7238/8246/files/mojirobupuzeragededeluji.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_off00006479.bin
da046b2dcdbdd1ea61a035fe6a01c0f4c4c9c1046a1ef96b6f1cbf02b9c8f653		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6479 5296 bytes
font_01_sfnt_off0000766c.bin
329c907865bdf6f32dfa420432863fc358db4abf69c292970bc463231bd011af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x766C 13332 bytes

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