Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd255114b2725c8f…

MALICIOUS

PDF

42.4 KB Authoring application: Nitro PDF
MD5: 2942a54180141234915766b8516b902a SHA-1: 520dd0169fb52d69bfcfd988ab7a1e0465f999fe SHA-256: bd255114b2725c8f5449f49c3bec19a0e0bcda6822d15b96863bc9a9f1dc34f7
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to external PDF files hosted on various domains, indicating a link farm or redirection scheme. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the critical heuristic 'PDF_SEO_LINK_FARM' strongly suggest a phishing or traffic-robotting intent. The document body, while containing some garbled text, also includes the URL http://missturquoisecircuit.com/uploads/1/3/0/5/130589385/5714049.pdf, reinforcing the link farm observation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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://missturquoisecircuit.com/uploads/1/3/0/5/130589385/5714049.pdf
    • http://ursulaohara.com/uploads/1/3/0/6/130622095/2745847.pdf
    • http://sunnydoggrooming.com/uploads/1/3/0/3/130323407/259787aa9b8d2.pdf
    • http://tovarioseni13.fun/uploads/2020/01/27/925139a2bdc679.pdf
    • http://zek.shopoonline.com/uploads/2020/01/28/gifuxemonipa-vakugetawasiroz-sovikepome.pdf
    • http://danyellscakesandcreations.com/uploads/1/3/0/6/130605442/9701bd922.pdf
    • http://bsa-sccc-pack301.com/uploads/1/3/0/2/130287242/130287242.html#dog+keeps+licking+lips+and+shaking

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001125.bin
e5109fea44476f612afb71246c040fe2dc0afeb7757a5346435bd14e47c7f56f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1125 8052 bytes

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