Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf27fafab8e90b2b…

MALICIOUS

PDF

39.9 KB Created: 2021-05-19 05:00:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3ef452b2f7b9a22a44baa49beadf49de SHA-1: b7b5c804b900bacc5bf6c437cc5857ab2556271f SHA-256: cf27fafab8e90b2b548b62b17fcffd4974f0793a47646d8761815926d296778a
130 Risk Score

Malware Insights

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

The PDF document contains embedded links that are identified as malicious redirectors, specifically promoting a 'Free Robux Hack Us' lure. The document body and heuristics indicate a clear intent to trick the user into clicking these links, likely leading to a second-stage payload or phishing site. The use of a download button lure further supports this malicious workflow.

Machine Learning

  • Nyx PDF Classifier clean score 0.0128

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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.
  • 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/431946152/free-robux-hack-us-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000034dc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34DC 25252 bytes
SHA-256: 6f41cfa9c29e6f377154c31b0a014cd232715b31d5669317c3ae57b65a0a0d42
font_01_sfnt_off00006f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F94 2908 bytes
SHA-256: e28d2c57f35643e2026f86c34ac3bb63cba74be3f6c066e81aba6d285e5a121b
font_02_sfnt_off0000798e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x798E 18600 bytes
SHA-256: be32b0f906764c1f2317decc7ac5a24a5975e1ace61028a3a9703984df87bb8b

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