Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81e01472bda155d…

MALICIOUS

PDF

35.4 KB Created: 2021-07-07 05:40:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b9793ecd0de0ed742d7b4c0496e10e53 SHA-1: c3c63a280461560064ed4ae58e03536a04a5ac5f SHA-256: c81e01472bda155d700449f8e476fbcae46a099b2454b54ff2ebff837a6743c8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document contains multiple embedded URLs and a prominent link in its body text, all related to 'Coin Master' and 'Robux' cheats, suggesting a lure for free in-game items. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs indicates a potential redirection to a malicious site or download. No scripts were extracted, but the overall pattern is consistent with a phishing or scam document designed to trick users into clicking malicious links.

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-15-free-spin-link-of-last-5-days-game-hack In PDF document text
    • https://ekbm.mankotapasuruan.sch.id/__statics/gudangsoal/files/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • https://ekbm.mankotapasuruan.sch.id/__statics/gudangsoal/files/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • https://ekbm.mankotapasuruan.sch.id/__statics/gudangsoal/files/fast-robux-online_GM431946152.pdfIn PDF document text
    • https://ekbm.mankotapasuruan.sch.id/__statics/gudangsoal/files/free-robux-real-no-survey_GM431946152.pdfIn PDF document text
    • https://ekbm.mankotapasuruan.sch.id/__statics/gudangsoal/files/how-to-get-coin-master-card-free_GM406889139.pdfIn PDF document text
    • https://ekbm.mankotapasuruan.sch.id/__statics/gudangsoal/files/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
    • https://ekbm.mankotapasuruan.sch.id/__statics/gudangsoal/files/only-you-little-mix-cheat-codes-roblox-id_GM431946152.pdfIn PDF document text
    • https://ekbm.mankotapasuruan.sch.id/__statics/gudangsoal/files/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • https://ekbm.mankotapasuruan.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • https://ekbm.mankotapasuruan.sch.id/__statics/gudangsoal/files/free-robux-script_GM431946152.pdfIn PDF document text
    • https://ekbm.mankotapasuruan.sch.id/__statics/gudangsoal/files/free-minecraft-mods-for-xbox-one_GM479516143.pdfIn PDF document text
    • https://ekbm.mankotapasuruan.sch.id/__statics/gudangsoal/files/getting-free-robux-for-being-13_GM431946152.pdfIn PDF document text
    • https://ekbm.mankotapasuruan.sch.id/__statics/gudangsoal/files/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://ekbm.mankotapasuruan.sch.id/__statics/gudangsoal/files/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • https://ekbm.mankotapasuruan.sch.id/__statics/gudangsoal/files/http-bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://ekbm.mankotapasuruan.sch.id/__statics/gudangsoal/files/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://ekbm.mankotapasuruan.sch.id/__statics/gudangsoal/files/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • https://ekbm.mankotapasuruan.sch.id/__statics/gudangsoal/files/how-do-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://ekbm.mankotapasuruan.sch.id/__statics/gudangsoal/files/8bp-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://ekbm.mankotapasuruan.sch.id/__statics/gudangsoal/files/cheat-roblox-2021-btools_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_off00003306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3306 22720 bytes
SHA-256: d8b5a9fa898c5cd3a036e0898d4fdd80a0836c340e9917ab1833a221305c8e72
font_01_sfnt_off000065cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65CD 18932 bytes
SHA-256: ab5bf67824d9f1de49592764067eca3c5a6c622e8f4c11d8ed5e999977e69fe8

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