Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f666bcdb943e05f…

MALICIOUS

PDF

36.5 KB Created: 2021-05-19 07:10:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5c1269fdd86821a777fc0c10a56ca150 SHA-1: 52ea34d751ea042f26c83a6c7c27a887a11ae340 SHA-256: 4f666bcdb943e05f301da749c0ace098e512e29dbee854d3fee36facb939e589
110 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a malicious redirector link disguised as a download button, aiming to trick users into visiting a URL associated with malicious infrastructure. The heuristic 'SE_CLICKFIX' indicates the document likely instructs users to manually execute commands, a common tactic to bypass security measures. Although no scripts were explicitly extracted, the PDF structure and malicious link suggest an attempt to execute further malicious code.

Machine Learning

  • Nyx PDF Classifier clean score 0.0292

Heuristics 4

  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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/479516143/1.13-hacked-client-game-hack In 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_003_off00003379.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3379 25540 bytes
SHA-256: 47d2c1f038aff1f27189ed77dab5d0429f3da1e0af97cd8798d2a2a8796cf2d5
font_01_sfnt_off00006d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D74 18332 bytes
SHA-256: ae32c8ac84da7f266a7f1e8339a6f8302c7db87da071292c5c130df84a098512

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