Malicious PDF — malware analysis report

Static analysis result for SHA-256 99356ae5347ae93f…

MALICIOUS

PDF

36.0 KB Created: 2020-09-01 03:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1e0e237ed3e8497d883dd7f16f0d023 SHA-1: 9e09b1f82dfa42e7e24e835b466645539b3a834a SHA-256: 99356ae5347ae93fb5fa0c9345357008e712f1206a8963bff287ebf357abb94e
150 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to malicious infrastructure, specifically a URL associated with a redirector. The document body text, though partially corrupted, suggests a lure related to 'Cambridge proficiency masterclass answers'. The presence of numerous external PDF links further indicates a link farm or redirection strategy. The ML classifier also strongly flagged this PDF as malicious.

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.ru/wix?keyword=cambridge+proficiency+masterclass+answers
    • https://static.usrfiles.com/ugd/6f53d7_ab9d808867544f9592b8258494fecf7c.pdf
    • https://static.usrfiles.com/ugd/e5cbe5_fc518ee15ad04595b024078653b6cf2f.pdf
    • https://static.usrfiles.com/ugd/0a0016_08257632ee8f4fc282c966236306a084.pdf
    • https://static.usrfiles.com/ugd/71fd01_63748a16e8ac4be9860201b8f242d1a4.pdf
    • https://static.usrfiles.com/ugd/9b5f63_7b11f0dd733442028c66ff1072f17cd6.pdf
    • https://cdn.shopify.com/s/files/1/0431/7764/0093/files/fugugubivu.pdf
    • https://cdn.shopify.com/s/files/1/0438/9660/2779/files/roberto_sampieri_metodologia_dela_investigacion_4_edicion.pdf
    • https://cdn.shopify.com/s/files/1/0435/3707/2280/files/iphone_app_to_add_text_to.pdf
    • https://static.usrfiles.com/ugd/93c935_2a5b13c13073438994412dfe60d3bffd.pdf
    • https://static.usrfiles.com/ugd/b8c837_fafa41c826854254940890c10bed8360.pdf
    • https://static.usrfiles.com/ugd/0047a4_e9ccaec3e2454e55b793a79a55722b8b.pdf
    • https://static.usrfiles.com/ugd/345929_6014ea425e7a4ce7857b8105799043d8.pdf
    • https://cdn.shopify.com/s/files/1/0438/6373/6485/files/28331047657.pdf
    • https://cdn.shopify.com/s/files/1/0431/6469/6732/files/vmware_free_license_key.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_off00004d80.bin
d78217968468e79b99247c97f41a02cbfc1dce5bcf394d99679212820b78c6cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D80 5716 bytes
font_01_sfnt_off000060ea.bin
fcf6736e1d224b144ed6694920b940945b5615e2a23b28eb41368905d4d7148d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60EA 9908 bytes

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