Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3e2b5a84b8c194…

MALICIOUS

PDF

37.1 KB Created: 2021-05-21 15:42:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 5c01affb383af47ebda998bc985234a9 SHA-1: 4c2195329684fae7b2b4c58cb30945a1c9a48d78 SHA-256: 8d3e2b5a84b8c194e46120086d43cd3b6e3b72b8ca08e6e1c706cd17b848a565
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious File

The PDF contains a malicious redirector link to a file disguised as a Minecraft download. It also includes heuristics indicating a lure to execute commands via the clipboard, suggesting the user is prompted to paste commands into a shell. The ML classifier also flagged this PDF as malicious. The combination of these factors strongly indicates an attempt to trick the user into downloading and executing a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 https://netcdn.xyz/app/479516143/minecraft-1.14-4-download-free-game-hack In PDF document text
    • http://www.hhls.com.au/images/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://www.hhls.com.au/images/freespinandcoin_GM406889139.pdfIn PDF document text
    • http://www.hhls.com.au/images/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • http://www.hhls.com.au/images/coin-master-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://www.hhls.com.au/images/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000036b8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x36B8 25072 bytes
SHA-256: a4ef9cce881228349d3a6e3df4a4aba2e2e3682607f34bcad9514161183a1e17
font_01_sfnt_off00006ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF5 18524 bytes
SHA-256: 401e73119c8810f8f819670611c256b8d42bff04f696ede40330d20cb64494a8

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