Malicious PDF — malware analysis report

Static analysis result for SHA-256 9993535f2a0adc3a…

MALICIOUS

PDF

38.5 KB Created: 2020-08-31 23:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c1b98ce4c0440827aaf37f2ffdb292b SHA-1: 6bd45f47e544e6b9ce339b427486d753f99a33f5 SHA-256: 9993535f2a0adc3a09d7b5d5dc181009547f06380b5330908626a4adf3a510bc
150 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The primary malicious URL, https://ttraff.cc/wix?keyword=equivalent+expressions+worksheet+grade+1, is likely used to direct users to a phishing or malware distribution site. The document body contains obfuscated text and numerous links, many hosted on Shopify, which are part of the link farm strategy to improve search engine ranking and distribute the malicious payload.

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.cc/wix?keyword=equivalent+expressions+worksheet+grade+1
    • https://cdn.shopify.com/s/files/1/0431/8923/9969/files/investment_banking_and_financial_services.pdf
    • https://cdn.shopify.com/s/files/1/0427/6004/4710/files/43382574527.pdf
    • https://cdn.shopify.com/s/files/1/0429/4692/0615/files/wapepakilew.pdf
    • https://cdn.shopify.com/s/files/1/0430/7274/9721/files/vawadovilakadi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5340/7646/files/52818553889.pdf
    • https://cdn.shopify.com/s/files/1/0427/5961/8716/files/fokiti.pdf
    • https://static.usrfiles.com/ugd/0cd019_41e7430aab684328a005a7ac97c0b840.pdf
    • https://static.usrfiles.com/ugd/f09a9d_be27b352696b417c8e584099e7d1015d.pdf
    • https://static.usrfiles.com/ugd/6908d7_5793f2d3fdc34ac99748e9a2e64b771d.pdf
    • https://static.usrfiles.com/ugd/837d34_740295abbb834a32b010b1fcde2036fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_b58860841bbd4c22b37deaf96173c724.pdf
    • https://static.usrfiles.com/ugd/daca0d_b6965f0a2b5c4fa8bbf7bab55c89a4b6.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a25.bin
9b30b429f34cffe13b1c54ef4e6d81810f1d5f0f7f9477703baec95fb68ab074		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A25 5520 bytes
font_01_sfnt_off00005cfe.bin
2574169fcd3c3fb96f41319e8cc6f5b1f0c15936c5752ec4e7b69ed343b7c03d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CFE 9936 bytes
font_02_sfnt_off00007eff.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EFF 4324 bytes

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