Malicious PDF — malware analysis report

Static analysis result for SHA-256 44344331cac7e903…

MALICIOUS

PDF

35.5 KB Authoring application: LibreOffice Draw
MD5: 2490dabdfa66d41cede037bd9a42aa80 SHA-1: 204ae1c41fbd3800d30243f0c73f38a40c85126a SHA-256: 44344331cac7e903e774abf598078e4142360b8fcc26ca9ee9619343a0cc009d
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, a technique often used for SEO manipulation or to redirect users to malicious sites. ClamAV identified this as Pdf.Phishing.TtraffRobotInstall-7605656-0, and a machine learning classifier also flagged it as malicious. The document body, while containing garbled text, also includes some of the URLs, reinforcing their presence as a key feature.

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://nataliekopitzke.com/uploads/1/3/0/4/130483338/66d848.pdf
    • http://alchemy.productions/uploads/1/3/0/2/130288594/84336.pdf
    • http://metdonuts.com/uploads/1/3/0/4/130488251/cad4d.pdf
    • http://timtucker.tv/uploads/1/3/0/6/130621916/cb76eb61082c1.pdf
    • http://pok.kewa.fun/uploads/2020/01/28/4343691.pdf
    • http://riversidecountyhistory.org/uploads/1/3/0/7/130739653/130739653.html#zelda+ocarina+of+time+gerudo+valley+heart+pieces

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000104f.bin
7fc610f3597bf44b50178e61acbd435f4b94321cbd02cf976d00c171a1e0d5e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104F 7996 bytes

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