Malicious PDF — malware analysis report

Static analysis result for SHA-256 66de3cfaf350d7f7…

MALICIOUS

PDF

56.7 KB Created: 2020-08-18 13:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc5161da4cd2f35dbc2458a0b1b62d00 SHA-1: dd5f134c7809128dbdc7cb7049328394759ad010 SHA-256: 66de3cfaf350d7f7c7f6099fcfdbc7b6ceb67020d84a8cb27a6dd8635d3f947b
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to a 'college loan calculator excel template' and a URL, suggesting a phishing or scam lure. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.com/pify?keyword=college+loan+calculator+excel+template
    • http://nujufedep.aowyn.photography/uploads/1/3/2/8/132814930/a25dfb5df19.pdf
    • http://kajuza.oceanescapestravel.com/uploads/1/3/1/4/131437657/7761342.pdf
    • http://files.oxfordgardendesign.com/uploads/1/3/2/7/132740852/5fec27.pdf
    • http://files.allseasonsafaris.com/uploads/1/3/1/6/131636655/lolikejinak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/9151/5805/files/centrifugal_chiller_operation.pdf
    • https://cdn.shopify.com/s/files/1/0431/2832/4257/files/nevagonukuvenaminajeb.pdf
    • https://cdn.shopify.com/s/files/1/0434/1969/7308/files/76039768828.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bewewolifokolugetu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3459/8809/files/xuxegufexog.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0402/files/computer_embroidery_designs_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/0349/5071/files/5_august_2019_weather_report.pdf
    • https://cdn.shopify.com/s/files/1/0439/5093/2123/files/31859714027.pdf
    • https://cdn.shopify.com/s/files/1/0428/9521/2697/files/template_id_card_portrait_cdr.pdf
    • https://cdn.shopify.com/s/files/1/0436/0405/0084/files/renotewunes.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a029.bin
429b626d244dbfeee0635e2006fd510ccdec5235c646f1ba0d6c3fb686c424b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA029 5048 bytes
font_01_sfnt_off0000b149.bin
e078b3cac4f11b1403cf538ddae296a98fc4b8f2fb240086532746e2a3e21ab9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB149 10656 bytes

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