Malicious PDF — malware analysis report

Static analysis result for SHA-256 916fd9aacf604f88…

MALICIOUS

PDF

42.4 KB Created: 2021-05-12 19:14:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b3d2c24d3ceceb56d829b49800b7f1eb SHA-1: 7ad40ccdf52cf4cf2c718203e5f2111df30cfd0d SHA-256: 916fd9aacf604f8840a51710b9ba5c3e22715071b28ad2339aa91079d908d2f2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as "free generator" or "game hack" lures. The primary redirector, https://netcdn.xyz/app/431946152/roblox-com-free-game-hack, is a critical finding. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or social engineering attack aimed at redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/roblox-com-free-game-hack In PDF document text
    • http://acp-institut.fr/images/coin-master-hack-ios-without-verification_GM406889139.pdfIn PDF document text
    • http://acp-institut.fr/images/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://acp-institut.fr/images/coin-master-hack-apk-2021_GM406889139.pdfIn PDF document text
    • http://acp-institut.fr/images/free-robux-glitch_GM431946152.pdfIn PDF document text
    • http://acp-institut.fr/images/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://acp-institut.fr/images/coin-master-hack-blogspot_GM406889139.pdfIn PDF document text
    • http://acp-institut.fr/images/free-spins-october-28-2021-coin-master_GM406889139.pdfIn PDF document text
    • http://acp-institut.fr/images/free-spins-coin-master-app-iphone_GM406889139.pdfIn PDF document text
    • http://acp-institut.fr/images/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • http://acp-institut.fr/images/how-to-hack-coins-in-archery-master-3d_GM406889139.pdfIn PDF document text
    • http://acp-institut.fr/images/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://acp-institut.fr/images/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://acp-institut.fr/images/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://acp-institut.fr/images/free-robux-come_GM431946152.pdfIn PDF document text
    • http://acp-institut.fr/images/robux-free-co_GM431946152.pdfIn PDF document text
    • http://acp-institut.fr/images/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • http://acp-institut.fr/images/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://acp-institut.fr/images/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://acp-institut.fr/images/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://acp-institut.fr/images/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ae3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AE3 25156 bytes
SHA-256: 5db167bf0625fdfe044d7045c720f1e49f4a70776db13eb10f5450c37e7ac551
font_01_sfnt_off00008384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8384 18208 bytes
SHA-256: 870646f3f52c1f0c0c96f328d01e02f351a6cd8131dd41c08f064fa7c3a02226

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