Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dcd8cbf9dbcb528…

MALICIOUS

PDF

31.9 KB Authoring application: Nitro PDF
MD5: c317bf4d6a907fb86bbc7a0692656a15 SHA-1: 34c54c629662fc741d8ffd708763062a712d6728 SHA-256: 1dcd8cbf9dbcb5280c3c3be3db4af1b508a1eae29099442f3d85172e0782821e
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links to external PDF documents, a technique commonly used for SEO poisoning or phishing. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier output strongly indicate malicious intent. The embedded URLs are likely part of a campaign to drive traffic to malicious or deceptive content.

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://rbvbiotech2016.weebly.com/uploads/1/3/0/5/130588807/1569318.pdf
    • https://nukujomota.weebly.com/uploads/1/3/0/5/130588588/zerezanojaj.pdf
    • http://myfureverfrenchie.com/uploads/1/3/0/3/130379252/kuwugexubuluve.pdf
    • http://mychoicewellness.com/uploads/1/3/0/5/130541462/rokuva.pdf
    • http://localfrio.net/uploads/1/3/0/6/130622036/3712991.pdf
    • http://spotlightphotos.net/uploads/1/3/0/5/130590279/32d9c5cd5.pdf
    • http://kikcrafts.com/uploads/1/3/0/6/130639495/36a6751b55710.pdf
    • http://myscigroup.com/uploads/1/3/0/4/130491166/4544056.pdf
    • http://xafeg.ted4mail.com/uploads/2020/01/28/feliwuragu.pdf
    • http://cecilyeiferle.com/uploads/1/3/0/6/130622005/130622005.html#epilogue+la+la+land+sheet+music+free

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001275.bin
8cfc9b475f99155472f47fcf931c7cfb8344b00605181489a46727e7a4f2abea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1275 9648 bytes

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