Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3fea49b54bc9fd4…

MALICIOUS

PDF

35.2 KB Created: 2020-04-28 14:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 01f8d9b3831d416f558151297d562c61 SHA-1: 5213e0893b907b2bd3b0679650eddd732d5eb2ba SHA-256: a3fea49b54bc9fd4b6bc097c015cdaac88c02047236751a29355b6ac2aeeabe4
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to other PDF files, a technique often used for SEO poisoning to drive traffic to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior. The document body itself is heavily obfuscated and contains embedded URLs, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://mmg-associates.com/uploads/1/3/0/5/130588834/130588834.html#consumer+buying+behaviour+thesis+pdf
    • http://simonbaatz.org/uploads/1/3/0/5/130540472/zuvilunobis.pdf
    • http://centrobeautyessence.com/uploads/1/3/1/0/131069738/a9042ed8cf.pdf
    • http://kickofflottery.com/uploads/1/3/0/5/130543065/2326037.pdf
    • http://idealadminconsult.com/uploads/1/3/0/6/130604093/1442546.pdf
    • http://lobstermatt.com/uploads/1/3/1/0/131070846/5683762.pdf
    • http://swsrealestate.com/uploads/1/3/1/3/131381533/dc0a2c.pdf
    • http://alphabiomet.com/uploads/1/3/0/3/130379118/1645508.pdf
    • http://us.finance/uploads/1/3/0/3/130312926/89d5dd27575401.pdf
    • http://bauvisionsobolewski.com/uploads/1/3/0/8/130874496/3404cd4b33b8ec1.pdf
    • http://thematerialgoods.com/uploads/1/3/1/6/131637789/xokoxix.pdf
    • http://drdeespalda.com/uploads/1/3/0/5/130539357/6301378.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000606f.bin
cc7462505a8e9db180a0814dff31676b9ccce381d7389d31d8807fc7ee2892f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x606F 8032 bytes

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