Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a7c961770c735d7…

MALICIOUS

PDF

34.6 KB Created: 2021-07-09 20:23:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 55ce1f258d1540a47c8b761d6c7b8211 SHA-1: ac21392dcec963c89a7c24152c360f6d04e5562b SHA-256: 3a7c961770c735d744bb7ee2b1641f1b1176d9cd65bb36a3bda3b41de23cd1b9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising 'free generator / game hack' lures. The document body reinforces this by mentioning 'Free Spin Coin Master 2021 Link' and embedding numerous URLs related to game hacks and virtual currency. The presence of these lures and the redirection to malicious sites strongly suggests a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

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/free-spin-coin-master-2021-link-game-hack In PDF document text
    • http://belajar.mtsnurulhudamangunsari.sch.id/__statics/gudangsoal/files/free-roebucks-com_GM431946152.pdfIn PDF document text
    • http://belajar.mtsnurulhudamangunsari.sch.id/__statics/gudangsoal/files/coin-master-100-spin-slot_GM406889139.pdfIn PDF document text
    • http://belajar.mtsnurulhudamangunsari.sch.id/__statics/gudangsoal/files/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://belajar.mtsnurulhudamangunsari.sch.id/__statics/gudangsoal/files/free-coin-master-spins-and-coins-for-daily_GM406889139.pdfIn PDF document text
    • http://belajar.mtsnurulhudamangunsari.sch.id/__statics/gudangsoal/files/coin-master-game-hacking_GM406889139.pdfIn PDF document text
    • http://belajar.mtsnurulhudamangunsari.sch.id/__statics/gudangsoal/files/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://belajar.mtsnurulhudamangunsari.sch.id/__statics/gudangsoal/files/cute-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • http://belajar.mtsnurulhudamangunsari.sch.id/__statics/gudangsoal/files/real-roblox_GM431946152.pdfIn PDF document text
    • http://belajar.mtsnurulhudamangunsari.sch.id/__statics/gudangsoal/files/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://belajar.mtsnurulhudamangunsari.sch.id/__statics/gudangsoal/files/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • http://belajar.mtsnurulhudamangunsari.sch.id/__statics/gudangsoal/files/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://belajar.mtsnurulhudamangunsari.sch.id/__statics/gudangsoal/files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://belajar.mtsnurulhudamangunsari.sch.id/__statics/gudangsoal/files/minecraft-toolbox-premium-apk_GM479516143.pdfIn PDF document text
    • http://belajar.mtsnurulhudamangunsari.sch.id/__statics/gudangsoal/files/free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://belajar.mtsnurulhudamangunsari.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-money-mac_GM431946152.pdfIn PDF document text
    • http://belajar.mtsnurulhudamangunsari.sch.id/__statics/gudangsoal/files/free-minecraft-education-edition_GM479516143.pdfIn PDF document text
    • http://belajar.mtsnurulhudamangunsari.sch.id/__statics/gudangsoal/files/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • http://belajar.mtsnurulhudamangunsari.sch.id/__statics/gudangsoal/files/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://belajar.mtsnurulhudamangunsari.sch.id/__statics/gudangsoal/files/hacks-para-strucid-roblox-2021-octubre-monedas-ilimitadas_GM431946152.pdfIn PDF document text
    • http://belajar.mtsnurulhudamangunsari.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-accounts-for-robux_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_off000031ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31CE 22204 bytes
SHA-256: df4ad96b5cb01795890bde0a5518fbe91e07fd5f078cb1aa209e3431b02ad2f1
font_01_sfnt_off0000632a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x632A 18748 bytes
SHA-256: 87551c50e6d609f3c8aae9c53aca7d1ad4c281dc834da60ceb94801aa8be48ba

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