Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb53203db7c8d0f…

MALICIOUS

PDF

47.9 KB Authoring application: Karbon
MD5: f3bf27b03b3c494af59a33aef54f41e2 SHA-1: 82a3f015abaa5e375a5cad92083a8d43c7fd522c SHA-256: bfb53203db7c8d0f355bd442f5da5868a5b94eb5de3b6732101174ba40bcb93d
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a 'PDF_SEO_LINK_FARM' and a ClamAV detection for 'Pdf.Phishing.TtraffRobotInstall-7605656-0'. The document body contains numerous embedded URLs, many of which point to external PDF files hosted on various domains. This indicates a likely phishing or traffic redirection scheme, where the embedded links are designed to lure users to malicious sites.

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.
  • 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://saltyrein.com/uploads/1/3/0/5/130589114/89d871bd776.pdf
    • http://ab4xy.com/uploads/1/3/0/4/130489909/d57a1.pdf
    • http://tiv.strongysha.xyz/uploads/2020/01/27/52cf2f66fb5265.pdf
    • http://chubbycheetah.com/uploads/1/3/0/4/130476786/2729881.pdf
    • https://wumibareve.weebly.com/uploads/1/3/0/5/130588333/lerumad-mipejugopojasi-buvarobalodas.pdf
    • http://zevixunig.dns-oldi-nix.info/uploads/2020/01/28/3fa93a2376.pdf
    • http://adamhamdy.net/uploads/1/3/0/5/130588931/xoweteg.pdf
    • http://mybabyluvz.com/uploads/1/3/0/5/130550681/6afdf61ae.pdf
    • http://backonyourfeetmassage.com/uploads/1/3/0/6/130605124/130605124.html#dell+xps+420+specs

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000011a1.bin
5f67cc553e71826c50706c82b5b6fb035738ed6536b9ec889262e5f1de9092aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1 8664 bytes
font_01_sfnt_off000074e9.bin
669a22844ddb84b64a1d93eb6147c2b8b7ca76f4316fe4be2bbf69c96252e72a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74E9 16180 bytes

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