Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f09f981a1840bc…

MALICIOUS

PDF

35.5 KB Created: 2021-07-10 01:14:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 6c0bc1131bcc7bdb49a7aea8c9c55c0a SHA-1: 42501628af23d0c6af928b1d03a2ab8e6bc38bab SHA-256: a4f09f981a1840bc7acaf0053e30cc9e3a11823d47cbb9d375aa4c1c77b175a1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The primary redirector URL identified is http://netcdn.tw/app/406889139/coin-master-hacks-that-work-game-hack. While no scripts were extracted, the document's structure and embedded URLs strongly indicate a phishing or scam attempt designed to trick users into visiting malicious sites. The ML classifier also flagged this PDF with high confidence.

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/406889139/coin-master-hacks-that-work-game-hack In PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-spin-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-robux-please_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/village-coin_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/pig-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/minecraft-gun-games-free_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-get-free-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-change-your-clothes-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/jail-break-roblox-money-hack_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-to-get-free-pets-in-adopt-me-roblox_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/are-robux-generators-safe_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/descargar-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/admin-vs-hacker-roblox-1_GM431946152.pdfIn PDF document text
    • http://www.himalassociation.org/himal/ck_image/files/how-do-you-get-roblox-money_GM431946152.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_off000034e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34E6 22840 bytes
SHA-256: 18d9bf8184910f46766f18e96ef1b4b5b2d03600786199d2ef814af99ac9d658
font_01_sfnt_off00006808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6808 18368 bytes
SHA-256: 1fee75e23ee4cf97c8b237062db8716a2f0b936689836d9a9228871b838f9a7f

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