Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe1824cba3db6e6…

MALICIOUS

PDF

53.6 KB Authoring application: PDF Studio
MD5: bc0e88b61c4b8b7d04fe85b0f15f1c88 SHA-1: 44809e43a84dd419c9b9582a97db9735e3978fab SHA-256: cfe1824cba3db6e68c8f949be33c00dc4d751117f1abbfd7899897492badf621
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical finding for a 'PDF_SEO_LINK_FARM' and ClamAV detection as 'Pdf.Phishing.TtraffRobotInstall-7605656-0'. The document body is heavily obfuscated, but the presence of numerous embedded URLs pointing to external PDF files suggests a malicious intent, likely to redirect users to phishing or malware hosting sites. The primary attack pattern involves leveraging a link farm within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://wrmsilim.weebly.com/uploads/1/3/0/2/130288579/88855272ad2f.pdf
    • http://killernailzzz.com/uploads/1/3/0/4/130490774/1cab9b33373426.pdf
    • http://bearsvbabies.org/uploads/1/3/0/6/130605403/bixapuzogarur.pdf
    • http://jezil.interio-mosaic.ru/uploads/2020/01/28/6303ec8739492.pdf
    • http://staywhole.net/uploads/1/3/0/5/130590186/130590186.html#bsc+english+notes+pdf+bzu

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00007479.bin
0bcd4b5a2e0271361cf88fec42a39e24c90ad5aa45a458fe3688c33e7ea3b8ab		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x7479 21424 bytes
font_00_sfnt_off00001187.bin
4cdd74f51948adb5ad14303e565cd3dd076a10ca44de1a0c41e26ee0d157a639		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1187 7992 bytes
font_02_sfnt_off00009686.bin
236d54f3e2479d5e72da3d1be4616617e509581c3e9108e812f40a19f40d28ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9686 2228 bytes

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