Malicious PDF — malware analysis report

Static analysis result for SHA-256 50cad00ab009b220…

MALICIOUS

PDF

41.5 KB Authoring application: LibreOffice
MD5: d9039c4fe147ea1c42ea9ce4da3ce906 SHA-1: 67f7bf7842f27bad597352d2052652a3c249982e SHA-256: 50cad00ab009b220ef3746825b060c5b60b9d1a8bdf221d2620aebe771d29325
150 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, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, also contains several of these URLs. This indicates a likely phishing or malware distribution attempt, where users are enticed to click these links. The ClamAV detection as Pdf.Phishing.TtraffRobotInstall-7605656-0 further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gibukaw.videolur.pro/uploads/2020/01/28/5156334.pdf
    • http://nordicwalkinglondon.com/uploads/1/3/0/6/130604456/guvibinojaluret.pdf
    • http://bodydelux.com/uploads/1/3/0/6/130604276/soriwavidaserug.pdf
    • http://napervillebedbugs.com/uploads/1/3/0/4/130476642/94f121c3f2381ca.pdf
    • http://miupnorthwedding.com/uploads/1/3/0/5/130588281/2924993.pdf
    • http://ndchair.com/uploads/1/3/0/3/130379272/130379272.html#ice+cream+machine+broke+template

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000010b9.bin
1b0be542863684591d27701d1e553746c832fc227fd5f50727e5169a7c311025		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9 8144 bytes

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