Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8915d303221f2a4…

MALICIOUS

PDF

46.5 KB Created: 2021-06-07 22:31:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5b65dcb6a1c4500a2784cd875c9038f4 SHA-1: e75c40fceba13ab6244a261ac82c78fe7607bdf4 SHA-256: a8915d303221f2a42441ce63791e67e22265bfb2079edcb2ce6491f2d2de8044
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to game hacks and generators to entice users. It contains multiple links pointing to known malicious redirector infrastructure, specifically directing users to 'roblox-build-a-boat-for-treasure-hack-2021-game-hack'. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the embedded URLs and the nature of the lure strongly suggest a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.tw/app/431946152/roblox-build-a-boat-for-treasure-hack-2021-game-hack In PDF document text
    • http://zercalo.org/images/easy-robux-generator_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/play-roblox-for-free-on-google_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-tiktok-fans-hack_GM835599320.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-tiktok-views-no-verification_GM835599320.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/roblox-robux-hack-android-apk_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/is-tiktok-app-free_GM835599320.pdfIn PDF document text
    • http://zercalo.org/images/free-modded-minecraft-server_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/coinmasterhack-club_GM406889139.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_004_off000051e3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51E3 27900 bytes
SHA-256: d69532e2929ec4288ee344a07061209d616b2e8df304632a1505dd886eb60512
font_01_sfnt_off0000905a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x905A 19288 bytes
SHA-256: 3217a3ee0630ee53b6ba2ea82e484a7c7f9e06c603f99a30a31f6ddf2e2e2a43

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