Malicious PDF — malware analysis report

Static analysis result for SHA-256 6528376c2f637625…

MALICIOUS

PDF

45.5 KB Created: 2021-06-08 16:46:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d9d31f8754c840a95893cbf66da3cd82 SHA-1: 28bc7f90317e4d5da09eca8182c76ff50cf7f498 SHA-256: 6528376c2f637625f8a11a4252805ad7443b493be923153ab3db4fa77f1b2eed
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a malicious redirector link, specifically pointing to a 'free generator / game hack' lure. The document body, though heavily obfuscated, contains text related to 'Rb Robux Unlimited Hack' and the malicious URL. This indicates a social engineering tactic to trick users into visiting a malicious site, likely to download further malware or engage in credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/rb-robux-unlimited-hack-game-hack In PDF document text
    • http://www.riverkennet.org/uploads/files/files/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/minecraft-images-free_GM479516143.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/minecraft-for-ipad-free_GM479516143.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/how-to-get-free-tiktok-followers-without-human-verification_GM835599320.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-coins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/how-to-get-to-village-3-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-free-spins-moonactive_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/archery-master-3d-coins-hack_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/minecraft-rtx-download-free_GM479516143.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-spins-coin-master-links-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-free-in-app-purchases_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/reddit-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/legit-coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-coins-and-spins-for-coin-master-game_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
font_00_sfnt_off00005321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5321 25136 bytes
SHA-256: a782a8e9daf7fc2554080e495f230ce1f9d126c43acfb181daaf59444c02dceb
font_01_sfnt_off00008cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CCA 19168 bytes
SHA-256: 01ed520f1f4426d6988a0454b003eff44514124bdfcf1d8e96280a427e5c55ea

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