Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcfcf16ee4122358…

MALICIOUS

PDF

38.0 KB Authoring application: Nitro PDF
MD5: cb0320536e7aef9806b5a4be8325e751 SHA-1: 25e31f469a8bcde48fb95dd8c7442ad0d4903572 SHA-256: dcfcf16ee41223580c87685a9e503d0d2eb90a2d88a865e5985fa261ce14c2d0
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs pointing to external PDF files across various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content, as suggested by the 'PDF_SEO_LINK_FARM' heuristic and ClamAV detection as 'Pdf.Phishing.TtraffRobotInstall-7605656-0'. No scripts were extracted from this sample. The ML classifier also strongly flagged this PDF as malicious.

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://bibledaily.com/uploads/1/3/0/5/130538988/4529413.pdf
    • http://befirelight.co/uploads/1/3/0/2/130271078/dfef7123.pdf
    • http://kompete.net/uploads/1/3/0/6/130621555/kisawidite.pdf
    • http://myeagerlaw.com/uploads/1/3/0/2/130289283/3170762.pdf
    • http://monaventurephoto.com/uploads/1/3/0/5/130543028/05539131e1310e2.pdf
    • http://millikenconsults.com/uploads/1/3/0/6/130639397/25bbd84aef72.pdf
    • http://veterinarycompounding.net/uploads/1/3/0/6/130621156/a6f4e24a96.pdf
    • http://andrewspickert.com/uploads/1/3/0/6/130620293/98091.pdf
    • http://garygame.com/uploads/1/3/0/5/130589122/3170e6e83.pdf
    • http://noypbc.co.nz/uploads/1/3/0/5/130590656/8645086.pdf
    • http://www.eleganceofwood.com/uploads/1/3/0/4/130435500/gagik.pdf
    • http://cloakanddaggerdc.com/uploads/1/3/0/4/130483868/zuxejefo_sidexifovewunav.pdf
    • http://hostmaster.petworthspire.com/uploads/1/3/0/6/130604467/1432019.pdf
    • http://aspenfamilymedicine.com/uploads/1/3/0/6/130604641/d5177.pdf
    • http://modelmefamous.com/uploads/1/3/0/5/130589207/zaxofewarimu.pdf
    • http://trinityjamestown.net/uploads/1/3/0/2/130272342/zimuvugoluv.pdf
    • http://www.threefifteen.net/uploads/1/3/0/6/130603936/3851617.pdf
    • http://www.laurengarciaphotography.com/uploads/1/3/0/8/130814858/dorogisowawu_fuzaso.pdf
    • http://mycthomson.com/uploads/1/3/0/5/130539871/dccdb5.pdf
    • http://my-pet-blog.com/uploads/1/3/0/6/130620483/maxovamipo.pdf
    • http://bshppopup.com/uploads/1/3/0/7/130776452/130776452.html#convert+string+to+base64+in+java+6
    • http://hostmaster.petworthspire.com/uploads/1/3/0/6/130604467/1432019.p

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003468.bin
65e255d2d5f729c27cecc8c2869f347c4cf5c21090c0020445989d85800734d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3468 8296 bytes

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