Malicious PDF — malware analysis report

Static analysis result for SHA-256 34e6939f5d48c1fd…

MALICIOUS

PDF

36.4 KB Created: 2020-09-17 05:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f1c369d7d5e9a40cec0344d93d910e9 SHA-1: 7be53ce8bb6532ece4ec0477c045e0d13f75052b SHA-256: 34e6939f5d48c1fd48ed4c65afa0f2e201d58f372cc9a61c13812fd1b97aa157
120 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One of the primary links, 'https://ttraff.link/wix?keyword=comma+or+semicolon+2+worksheet+answer+key', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to this malicious URL and other benign-looking PDF links, suggesting a link farm or SEO poisoning tactic to lure users to malicious infrastructure. The primary intent appears to be redirecting users to malicious sites under the guise of providing worksheet answers.

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=comma+or+semicolon+2+worksheet+answer+key
    • http://fikup.kylekopko.com/uploads/1/3/1/1/131164358/c5494029cdd73e.pdf
    • http://files.midcoastconsult.com/uploads/1/3/1/3/131379718/mexujikulamo.pdf
    • http://gedivar.carsga.org/uploads/1/3/1/4/131437683/sukura.pdf
    • http://tejawef.wakeupandwritewrw.com/uploads/1/3/1/4/131406390/9910792.pdf
    • http://files.mounttaborbaseball.com/uploads/1/3/0/8/130813982/9700333.pdf
    • https://cdn.shopify.com/s/files/1/0462/9004/3040/files/wenegutub.pdf
    • https://cdn.shopify.com/s/files/1/0431/2799/6565/files/nuwegosekiditabobisuki.pdf
    • https://cdn.shopify.com/s/files/1/0431/9245/1235/files/worksheet_on_communicable_and_noncommunicable_diseases.pdf
    • https://cdn.shopify.com/s/files/1/0432/7853/2774/files/83982494489.pdf
    • https://cdn.shopify.com/s/files/1/0464/6656/4254/files/bd_gh3000_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/0414/8382/files/41409952507.pdf
    • https://cdn.shopify.com/s/files/1/0431/1810/0637/files/46222732212.pdf
    • https://cdn.shopify.com/s/files/1/0433/1238/2116/files/23641191241.pdf
    • https://cdn.shopify.com/s/files/1/0463/4660/0605/files/muwulafopirutebulum.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_off000051ac.bin
b54a825b0197b1315d84f98d23b0e62f46bd0d1d66a15a721616e35a522890a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51AC 5336 bytes
font_01_sfnt_off000063b3.bin
b00612a86d22159cf52e4c2fa42934373c9fc076fbe6ac4d9fd6d826d39a3094		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63B3 9720 bytes

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