Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16f1e1376bfc776…

MALICIOUS

PDF

43.6 KB Created: 2020-08-30 09:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4fa8d6c2e7f77375ba37699f900c9a8a SHA-1: 40e343157452cee52cf02ce6a8a521d0c3ff5824 SHA-256: f16f1e1376bfc776cf546c57da648b57213f436e46101f01ae592a065a2d58ea
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous embedded links, a technique often used for SEO poisoning or to redirect users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/wix?keyword=medical+terminology+complete+3rd+edition'. While the document body is heavily obfuscated, the presence of this malicious redirector strongly suggests a phishing or malware delivery attempt.

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=medical+terminology+complete+3rd+edition
    • https://static.usrfiles.com/ugd/02beb7_3d7a024f5147491596086eddc14b0727.pdf
    • https://static.usrfiles.com/ugd/55cc32_c036902834754e01b9cb6ef611e62d38.pdf
    • https://static.usrfiles.com/ugd/b8c837_25d91c7bdb5b46f9a90f6ebb338b124c.pdf
    • https://static.usrfiles.com/ugd/a6e5e9_7ad0dc45e38841c7b139106eee327323.pdf
    • https://static.usrfiles.com/ugd/b8c837_182fe6f271aa45109f0ab0f504532aa5.pdf
    • https://static.usrfiles.com/ugd/2486b5_ec66a0a30cd64a739a8eec79e329c15e.pdf
    • https://static.usrfiles.com/ugd/b8c837_bd03473404844518865e89524af5adb7.pdf
    • https://static.usrfiles.com/ugd/3f0e57_4d4cc921c18943b4a0eb69b7775913e5.pdf
    • https://static.usrfiles.com/ugd/3f0e57_81ae061e01ff46dea59e0dc06ff4b153.pdf
    • https://cdn.shopify.com/s/files/1/0429/0609/1673/files/kopal.pdf
    • https://cdn.shopify.com/s/files/1/0434/5040/0928/files/bengali_calendar_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/2175/3758/files/lofabojejusavagalamuwup.pdf
    • https://cdn.shopify.com/s/files/1/0433/9341/7366/files/wudexobole.pdf
    • https://cdn.shopify.com/s/files/1/0431/5598/0450/files/jalipusafijowinodoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/5013/9801/files/rugetojapo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1309/5073/files/52224921168.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_off00006c53.bin
c5efeddf2d4c8fb32556e4649ea0430867bf360a1dd9d2b72da1cb7974f62259		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C53 5488 bytes
font_01_sfnt_off00007ef4.bin
c2fa52f4df507b3bac7ef1a2d7ebbb9f2fb07a1a44a51a5d32ae8410754f3d3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF4 9932 bytes

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