Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8c4c426e3b833b…

MALICIOUS

PDF

53.2 KB Authoring application: Nitro PDF
MD5: 4e1058cac0c864336eafd9990fefa088 SHA-1: 6d9a43b03e8fab9dbfb4104b50d19d893445e7cf SHA-256: 3b8c4c426e3b833b16889b3a07603e23c6cae53430a85cdd61c24d203f680971
128 Risk Score

Malware Insights

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

The PDF contains a link farm of external PDF files, indicating a phishing or malicious redirection attempt. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' further supports this. The document body, though heavily obfuscated, contains URLs that are likely part of the lure to download additional malicious content.

Heuristics 4

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nikaspaus.com/uploads/1/3/0/6/130639373/lizezenok.pdf
    • http://kolag.materialystroitelnye.ru/uploads/2020/01/28/aec716f3.pdf
    • http://redskinscheerleaderalumni.com/uploads/1/3/0/6/130639304/8436579.pdf
    • http://thegardenstencil.com/uploads/1/3/0/3/130379237/jobiwanat.pdf
    • http://jwlabs.dev/uploads/1/3/0/2/130287401/xiron.pdf
    • http://murrayparkcondos.com/uploads/1/3/0/4/130488734/130488734.html#capsa+susun+for+pc+apk

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000110e.bin
6f7bcecd802aff01fc5ce0a5829337c26b2fbf1c1051a1e78312ddf4cf7129e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110E 9544 bytes
font_01_sfnt_off00006c00.bin
429a049aeeb1247cd5e90dd2a9f75614d1554e3a27aa00acbcd6397a9fb76904		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C00 17020 bytes
font_02_sfnt_off0000839e.bin
e156c39f59e0587782269d3ff98a4fc26286e6aa32f665925da19e5efb61654d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x839E 5364 bytes
font_03_sfnt_off00009444.bin
4614d7948562326268cf804ffe5293c5c0fdf9d22fe9190d3a7e92f8b080b422		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9444 2952 bytes

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