Malicious PDF — malware analysis report

Static analysis result for SHA-256 a674a6f64db7fc72…

MALICIOUS

PDF

40.4 KB Authoring application: Smallpdf Desktop
MD5: f9f59f0bc3ee89a910876e90aa1996c6 SHA-1: c03a7fed77e9ef34c2368296044f9a3b3a931c6f SHA-256: a674a6f64db7fc72b5779a211618724d59156531927dd9e54467d88a247d7d8c
150 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to other PDF files hosted on various domains. This technique is often used for SEO manipulation or to distribute malicious content. The ClamAV detection as 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier's high confidence score further support the malicious nature of this document. No scripts were extracted, and the document body content is heavily truncated and unreadable.

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://0ys5k.bpmtc.com/uploads/1/3/0/6/130604218/5430081.pdf
    • http://summitcityexposure.com/uploads/1/3/0/7/130739549/sisilisalumaber.pdf
    • http://dirkhasslehoff.com/uploads/1/3/0/2/130291531/7549585.pdf
    • http://healthe-pass.net/uploads/1/3/0/7/130739629/dasubad-mavipakudozifuw.pdf
    • http://cavasur.com/uploads/1/3/0/2/130289224/9373794.pdf
    • http://cemetco.org/uploads/1/3/0/5/130539074/91be0ece9aeb3b.pdf
    • http://naaboard.com/uploads/1/3/0/7/130740209/rojaruvexazafud-mivejinediwopev-gumofekorofuj-mafaloxati.pdf
    • http://www.minneapolis-organizing.co/uploads/1/3/0/2/130289682/gagixikimise.pdf
    • http://1minutebrush.com/uploads/1/3/0/6/130639563/d44d07a647d3.pdf
    • http://myhappilyeverafters.com/uploads/1/3/0/2/130271108/tavepomu_volawowi_dukek_fuluparawigu.pdf
    • http://el006.elrepco.com/uploads/1/3/0/5/130551378/sinexapuk-jubox-xawivaz-nubifem.pdf
    • http://peelerapp.com/uploads/1/3/0/7/130739243/vomurizofoxetof.pdf
    • http://livelongitude.voyagerwebsites.com/uploads/1/3/0/3/130313513/130313513.html#how+to+decline+a+job+offer+due+to+salary+template
    • http://peelerapp.com/uploads/1/3/0/7/130739243/vomur

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002dde.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2DDE 16036 bytes
font_01_sfnt_off00004503.bin
c2cd57a6da3ff3bc5db6673424bf110a9bdda23954edf0e6c9bc820c9f190c29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4503 8140 bytes

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