Malicious PDF — malware analysis report

Static analysis result for SHA-256 27758c53b4eb1be2…

MALICIOUS

PDF

35.9 KB Authoring application: Nitro PDF
MD5: 00d78c27bf047157f65c164000d33e84 SHA-1: 718cfdf5cb375202676880048350465c6a14522f SHA-256: 27758c53b4eb1be2ecd7567eb719d3b8bf9d2bba04d41d5c3778060095c0cf0d
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly indicate maliciousness, specifically classifying it as Pdf.Phishing.TtraffRobotInstall. The document body, though heavily obfuscated, also contains many of these external URLs, reinforcing the finding that the primary function is to redirect users to a link farm. No scripts were extracted from this sample.

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://esther-schreier.net/uploads/2020/01/28/goxube.pdf
    • http://zamatita.etg-store.com/uploads/2020/01/27/soworevomorelowi.pdf
    • https://benosatini.weebly.com/uploads/1/3/0/5/130547116/4584980.pdf
    • http://zodi.wellsonlineserviceverifications.biz/uploads/2020/01/29/8363058.pdf
    • http://mskreslo.ru/uploads/2020/01/27/xavominigivaku-kikafo-jibobef-wodonujiw.pdf
    • http://myamandarogers.com/uploads/1/3/0/6/130621501/283594.pdf
    • http://newgaterva.com/uploads/1/3/0/4/130476068/vuwozope-xisezebujide-rufari.pdf
    • http://datingwebclub.com/uploads/2020/01/27/dikil.pdf
    • http://lthousestudio.com/uploads/1/3/0/5/130590154/d8aadbf8068d4c.pdf
    • http://mississauganations.com/uploads/1/3/0/4/130476048/fexibujenatefod.pdf
    • https://fenodunow.weebly.com/uploads/1/3/0/4/130476574/xesiluluba.pdf
    • http://ziro.web-delo.icu/uploads/2020/01/28/7849552.pdf
    • http://vunom.car-tier.com/uploads/2020/01/29/6131775.pdf
    • http://zufodowi.quran-media.online/uploads/2020/01/28/savenewubaju.pdf
    • http://alphamediaagency.com/uploads/1/3/0/6/130604222/2030577.pdf
    • http://theleawoodfamilydentist.com/uploads/1/3/0/6/130604408/130604408.html#photodiode+array+detector+pdf

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001391.bin
3964bf5b6dac13d262661f2bfa7634a71bfea91959ec64a3a064b71b1f2bebe4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1391 7256 bytes

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