Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c821711712ed45…

MALICIOUS

PDF

46.8 KB Created: 2021-06-07 14:00:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0f52300271bc2f6e9abe64a8d0b5c3db SHA-1: 7665b302028fae24cf7ed581e86914826e9ff9bb SHA-256: 71c821711712ed45e1b7a5fb8b10edc8037745e9508c1b18de26711ace974ff3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and infrastructure, disguised as game-related content like 'money hack' or 'free spins'. The document body and embedded URLs strongly suggest a social engineering lure to trick users into visiting these sites, which likely serve as a gateway to further malicious downloads or phishing attempts. No scripts were extracted, but the PDF structure and embedded URLs are sufficient indicators of malicious intent.

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/money-hack-sur-sunset-city-roblox-2021-game-hack In PDF document text
    • http://stpc.it/images/minecraft-dungeons-free-download_GM479516143.pdfIn PDF document text
    • http://stpc.it/images/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://stpc.it/images/robux-premium_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/free-roblox-followers-generator-2021_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/make-robux_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/coin-master-34-4-free-download_GM406889139.pdfIn PDF document text
    • http://stpc.it/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/coin-master-free-spins-link-deutsch-ios_GM406889139.pdfIn PDF document text
    • http://stpc.it/images/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://stpc.it/images/hacks-para-roblox_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/free-account-roblox-2021_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/coin-master-spin-hack-trick_GM406889139.pdfIn PDF document text
    • http://stpc.it/images/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/archery-master-3d-apk-and-mod-free-download-unlimited-coins_GM406889139.pdfIn PDF document text
    • http://stpc.it/images/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/coin-master-free-in-app-purchases-jailbreak_GM406889139.pdfIn PDF document text
    • http://stpc.it/images/how-to-get-free-bc-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://stpc.it/images/tiktok-free-vpn_GM835599320.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000514e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x514E 27580 bytes
SHA-256: 29bfc788faa1e424d4f0a4127cd1244d0357c3220f418a41c012d0f62adbb51a
font_01_sfnt_off0000910e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x910E 19324 bytes
SHA-256: 977a9984b89b77f331df22606dadab20239d8e8238d706486b81ed700fca249d

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