Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76b4a5b6db7395b…

MALICIOUS

PDF

42.7 KB Created: 2020-09-28 18:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01646c311e28a6d49934fdffa1339473 SHA-1: df7bf12940288e5bb3263c326f91a82d0ef93932 SHA-256: a76b4a5b6db7395bbe6367c15130519cedcbcf4cbdc75de3670ef7b2fff98bdc
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to suspicious domains and redirectors, indicating a link farm or phishing attempt. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are consistent with the heuristic findings.

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://cctraff.ru/mozel?keyword=swot+analysis+pdf+for+students
    • http://files.maitri-midwifery.com/uploads/1/3/1/1/131163920/2964a63.pdf
    • http://files.northliverpoolteachingschool.org/uploads/1/3/1/0/131070246/48c929.pdf
    • http://files.garrityrights.org/uploads/1/3/2/6/132682035/a830efa6.pdf
    • http://files.longgame.co.uk/uploads/1/3/1/1/131163590/ac435e5c43f161.pdf
    • http://files.cokosscrubs.com/uploads/1/3/0/7/130738641/678690.pdf
    • http://files.cdconggiaovietnamvic.org/uploads/1/3/1/4/131453573/kisosi.pdf
    • http://files.moonhawkvisions.com/uploads/1/3/2/7/132741225/vizod.pdf
    • https://site-1037115.mozfiles.com/files/1037115/53920744356.pdf
    • https://site-1037086.mozfiles.com/files/1037086/fedatux.pdf
    • https://cdn.shopify.com/s/files/1/0464/9022/2744/files/ditanusedanela.pdf
    • https://cdn.shopify.com/s/files/1/0433/4832/8603/files/47776082909.pdf
    • https://cdn.shopify.com/s/files/1/0437/0379/5865/files/anaerobic_glycolysis_pathway.pdf
    • https://cdn.shopify.com/s/files/1/0438/7579/5099/files/wurevefusetomituzizijuvi.pdf
    • https://cdn.shopify.com/s/files/1/0435/4077/5071/files/7084513125.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_off0000681b.bin
f7330a69002274e34241a2a7e3930d3dece26a43afdf64ce31e0ccf012c1cdce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x681B 5332 bytes
font_01_sfnt_off00007a67.bin
2d224b8308e2395e83811b7fba1318f83933e29b2db4f4213c7b5fbef44bcd8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A67 10512 bytes

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