Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf696a3a8f407e3d…

MALICIOUS

PDF

53.2 KB Authoring application: GIMP
MD5: e2e6bb593bea0a4043775eab66a8fec6 SHA-1: 8465822d28fa337cdadf03d104a620a9de94bf7c SHA-256: bf696a3a8f407e3d7ced46ddf0e806dbe992a86c9daed3189a120a10b939168d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier output strongly indicate malicious intent. The primary purpose appears to be directing users to a network of SEO-optimized PDF files hosted on various domains, likely for phishing or malware distribution.

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://salafarofo.idealica1.com/uploads/2020/01/28/vimito.pdf
    • http://napavalleyentertaining.com/uploads/1/3/0/6/130621335/2051323.pdf
    • http://ashiyanallc.com/uploads/1/3/0/2/130287842/8996eb7.pdf
    • http://businessbella.com/uploads/1/3/0/6/130639859/josut_tavusikabu.pdf
    • http://mosiacpreschool.com/uploads/1/3/0/3/130323319/2045569.pdf
    • http://kreativekidsworld.com/uploads/1/3/0/4/130478004/130478004.html#freie+Mitarbeiter+Stundenzettel

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000010fc.bin
c8d427032130368c698c57be2d9dd2e17f343a677f9e0a055802fd2308468669		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC 10156 bytes
font_01_sfnt_off00008b0c.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B0C 16036 bytes

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