Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9af52cbf7b561f2…

MALICIOUS

PDF

43.0 KB Created: 2021-05-15 10:15:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d44a551b1763a9b51d4e8effc64a4b6d SHA-1: bdd02d9af8c83a46099509a74715d58bcea82dd7 SHA-256: f9af52cbf7b561f28b27bde75345f31b5df3e94b26e72f9b81e1936bfb9df490
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links designed to lure users into clicking on them, ostensibly for free game items or currency. The primary link, 'https://netcdn.xyz/app/406889139/coin-master-free-spins-ios-2021-game-hack', is identified as a malicious redirector. The document body and embedded URLs suggest a social engineering tactic to drive traffic to potentially malicious sites. No scripts were extracted, but the PDF structure and embedded links strongly indicate a phishing or scam attempt.

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/406889139/coin-master-free-spins-ios-2021-game-hack In PDF document text
    • https://www.brainpads.com/images/how-do-you-get-roebucks-for-free_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/daily-spin_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/picture-roblox_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/how-to-get-minecraft-java-free_GM479516143.pdfIn PDF document text
    • https://brainpads.com/images/roblox-free-items_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/my-minecraft-account-was-hacked_GM479516143.pdfIn PDF document text
    • https://brainpads.com/images/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • https://brainpads.com/images/free-robux-discord_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/coin-master-hacking-news_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/wurst-client_GM479516143.pdfIn PDF document text
    • https://brainpads.com/images/roblox-e-free_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/coin-master-hack-online-no-human-verification_GM406889139.pdfIn PDF document text
    • https://brainpads.com/images/hacked-roblox-accounts-list_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/coin-master-hack-mod-apk-2021-download_GM406889139.pdfIn PDF document text
    • https://brainpads.com/images/coin-master-ios-hack_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/free-roblox-adopt-me-accounts_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/free-vpn-for-minecraft_GM479516143.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
stream_003_off0000484e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x484E 26096 bytes
SHA-256: 151d7696cba09d11575370d7e883c956f8153fb665df7b2fa69c2e76c39c3706
font_01_sfnt_off000085b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85B7 18288 bytes
SHA-256: 2b6efa5e62152ff8c49d64075f52aeeb5d732445f14fabab56fec2f8f3dafea1

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