Malicious PDF — malware analysis report

Static analysis result for SHA-256 deaacd9bd5b8f58a…

MALICIOUS

PDF

40.9 KB Created: 2020-08-12 05:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1fd361adf0d46d68832e4c67e5bfa81 SHA-1: d176cd6b0ce3faae31a356a526fc4f2544ec35e6 SHA-256: deaacd9bd5b8f58ad4a01c21a40bf204934a2597d4e453b277f84aa93401c6b6
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Genetics worksheet pdf answers' and the malicious URL, suggesting a lure to trick users into clicking the malicious link. 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.ru/pify?keyword=genetics+worksheet+pdf+answers
    • http://files.pacref.com/uploads/1/3/1/4/131483002/7621381.pdf
    • http://vopegagij.sillycvs.co.uk/uploads/1/3/1/3/131398547/xawobe.pdf
    • http://files.julescritchinson.com/uploads/1/3/2/6/132681556/4994332.pdf
    • http://files.irvingtonfbla.org/uploads/1/3/1/3/131380901/6091119.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0938/files/jewofijakonobudiri.pdf
    • https://cdn.shopify.com/s/files/1/0428/2174/6847/files/pibotetudaganujigikun.pdf
    • https://cdn.shopify.com/s/files/1/0434/4394/5628/files/jogojifo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2891/4087/files/esquema_de_vacunacion_antirrabica_humana.pdf
    • https://cdn.shopify.com/s/files/1/0438/0635/9714/files/63147048203.pdf
    • https://cdn.shopify.com/s/files/1/0437/1139/8039/files/canara_bank_net_banking_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0435/4772/1882/files/42351490976.pdf
    • https://cdn.shopify.com/s/files/1/0430/3532/8661/files/46198328862.pdf
    • https://cdn.shopify.com/s/files/1/0434/3804/7388/files/4391345731.pdf
    • https://cdn.shopify.com/s/files/1/0431/3510/7233/files/nojukibaxesi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5004/9448/files/bach_bourree_guitar.pdf
    • https://cdn.shopify.com/s/files/1/0436/0133/0339/files/76833355984.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_off000061ad.bin
ca7425c6c9f25fc247a8895b59badd2ce31d5aec29223ae86a11592cb9296eb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61AD 5400 bytes
font_01_sfnt_off00007420.bin
8e8a3a6503a29ba923f3ae5bc2c49e9c83df24e095756b97b02123e1612fcaec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7420 10132 bytes

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