Malicious PDF — malware analysis report

Static analysis result for SHA-256 77fd40acf407bc54…

MALICIOUS

PDF

40.7 KB Authoring application: ImageMagick
MD5: 61cea33e9fd4df21b3d4682f99218214 SHA-1: b6feb93b3c297dfd18aa05ebdc9831d8e8f944be SHA-256: 77fd40acf407bc54f46d8f1132e588c98a23aca65f21c2a81be3afa50a5e8c47
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links to external PDF files hosted on unrelated domains, a technique often used in SEO spam or phishing campaigns to drive traffic. ClamAV and a machine learning classifier also flagged this file as malicious, specifically as a phishing-related PDF. The embedded URLs are the primary IOCs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://balancedwaw.com/uploads/1/3/0/5/130590105/kiduv.pdf
    • http://beautifulhabits.net/uploads/1/3/0/3/130313657/fotagatutijuzap.pdf
    • http://thesoftearth.com/uploads/1/3/0/6/130620601/xegorekoli.pdf
    • http://moksamassage.com/uploads/1/3/0/6/130603917/130603917.html#5e+critical+hit

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00000fac.bin
3069d5f30bcb67066aa3bca526657fea25553114acec258053357301168d59e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC 8544 bytes

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