Malicious PDF — malware analysis report

Static analysis result for SHA-256 5592a4d1bac1c0e4…

MALICIOUS

PDF

41.7 KB Authoring application: PDFBox
MD5: b5f2efa761a2b86f7fec7a90e0142228 SHA-1: 4a5b2a285d32a8a59198fa2e5962ed3a1b22eaba SHA-256: 5592a4d1bac1c0e4a86f999735779a73ba4c3e33bfe15cc48c1d150c99481428
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to external PDF files, a technique often used for SEO poisoning or to redirect users to malicious content. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier strongly indicate malicious intent. The document body appears to be corrupted or heavily obfuscated, preventing a clear understanding of its specific lure.

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://nelsonrivas.com/uploads/1/3/0/7/130775543/7f802a.pdf
    • http://nutgraf.ca/uploads/1/3/0/6/130621052/f664fdbf494.pdf
    • http://holisticnirvanainstitute.com/uploads/1/3/0/5/130541208/musomi-zukapu-vuxesaxi-bewido.pdf
    • http://thedepths-game.com/uploads/1/3/0/2/130274368/5714982.pdf
    • http://badgeyourclassroom.com/uploads/1/3/0/7/130739437/sifipikobofuza_tufirozetexu.pdf
    • http://www.frc5285.com/uploads/1/3/0/6/130604509/9226329.pdf
    • http://opiatefreemeds.com/uploads/1/3/0/5/130589250/611325.pdf
    • http://10thkind.com/uploads/1/3/0/7/130775411/1954481.pdf
    • http://readeveryebook.com/uploads/1/3/0/4/130483454/polir.pdf
    • http://supernatural-wellness.com/uploads/1/3/0/7/130776371/b38da.pdf
    • http://childfreedom.net/uploads/1/3/0/4/130478123/nuduvuvufukas.pdf
    • http://tagumcitygym.com/uploads/1/3/0/3/130313376/147f7b451386.pdf
    • http://capacityperformance.bardosdiamondsports.com/uploads/1/3/0/4/130477007/130477007.html#count+and+noncount+nouns+activities+esl
    • http://thedepths-game.com/up

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000032ce.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x32CE 16036 bytes
font_01_sfnt_off00004a14.bin
05922d4ccf68adbe1bfc1c3c6c5ca4aac294f4b606e5e3fe0cffd30aa93fd239		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A14 8236 bytes

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