Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d7cf885d975340…

MALICIOUS

PDF

35.1 KB Created: 2021-07-03 20:29:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 716bbf4c70ec1561865d67bd94b4088b SHA-1: ab1ef70e206942e62069bb754dafd760bbca0a2c SHA-256: c5d7cf885d9753401dce7aa4f8abca159613758a869114daba2ffd57ada9bc63
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that lead to sites offering game hacks and free in-game currency, such as 'free Robux'. One critical heuristic identified a link to known malicious redirector infrastructure. The document body explicitly mentions 'Free Robux 2021 No Human Verification' and includes the primary malicious URL, indicating a phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/free-robux-2021-no-human-verification-game-hack In PDF document text
    • http://rgadventure.com/userfiles/files/coin-master-unlimited-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/no-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/coin-master-free-spins-hack-ios_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/como-descargar-coin-master-hackeado_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/minecraft-bedrock-free-with-java_GM479516143.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/free-private-minecraft-server_GM479516143.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/coin-master-official-fan-page_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/free-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/how-to-download-minecraft-for-free-on-your-phone_GM479516143.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/how-to-hack-coin-master-ios-2021_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/hack-coin-master-using-cheat-engine_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_off00002f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F36 22680 bytes
SHA-256: 2fcf05b2899a03966bc707fecae827e5ccc6cd688e441cdba7d49657058c058a
font_01_sfnt_off000061f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61F7 19736 bytes
SHA-256: 415a8643b263bdb8a5e4ae51f1e0119ae52f9187a77a7c28158d674e6dc65c25

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