Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1253b21732cc63…

MALICIOUS

PDF

36.7 KB Created: 2021-07-04 20:31:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b11f87c8f7798b3a87ff5879c3409a3f SHA-1: 718eb8600e07d2a11e0e8a929dc3043e2ecf950b SHA-256: 5c1253b21732cc6348bf60912026368099aa2cddadc60cd6ada3bf7debc66840
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for free Roblox currency, directing users to a URL that likely hosts a malicious download. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs and embedded links further supports a phishing or malware distribution attempt. No scripts were extracted, but the document's content and external links indicate a social engineering tactic to trick users into downloading a payload.

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/431946152/free-account-roblox-with-robux-game-hack In PDF document text
    • https://digilib.stimlog.ac.id/repository/is-roblox-account-hacked_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-tattoos-in-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-hack-without-downloading-apps_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-royale-high-diamond-hacks_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-roblox-merch_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-hackprogamers-com_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-page-no-human-verifaction-no-surves-no-email_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-2021-sans-verification_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/get-me-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/best-way-to-get-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-on-mobile-ios_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-robux-inspect-hack_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-cheat-apk-free-download_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-one-piece-millenium-hacks_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-followers-for-tiktok_GM835599320.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/secrect-free-rooms-in-roblox-high-school_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-roblox-games-scripts_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-minecraft-skins-pe_GM479516143.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_002_off000035a7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x35A7 23204 bytes
SHA-256: e76838aa06aceeb0733dbfef0910170980572390a5d3f80520010d5ae8c044d3
font_01_sfnt_off0000698f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x698F 19376 bytes
SHA-256: aca93b4e3f604d5c7fb305f64f27e26b52b7bc87275afcbcda3d4758617aefe4

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