Malicious PDF — malware analysis report

Static analysis result for SHA-256 774286bf20ade4b2…

MALICIOUS

PDF

45.2 KB Created: 2021-06-11 04:05:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: feb453d961a5e1f010ad5c7d5579f511 SHA-1: 2394deb36ae7c7f7686195ee663fc438e4cfbafe SHA-256: 774286bf20ade4b2861564ef7cbea54a8dcad454b5f194a792db8e59e1ce752f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free Robux' or game hacks. The ML classifier and specific PDF heuristics strongly indicate malicious intent. The embedded URLs are designed to lure users to potentially malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/free-robux-100-real-no-fake-roblox-game-hack In PDF document text
    • http://digilib-unirow.ac.id/repository/border-games-with-free-groups-roblox_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/tiktok-free-nose-job_GM835599320.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/is-roblox-studio-free_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/coin-master-link-spin_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/is-minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/free-robux-co_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/roblox-cbx4-hack_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/daily-free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/coin-master-free-spin-redeem-code_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/what-games-give-you-robux_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/get-free-spins-link-in-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/free-robux-real_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
stream_004_off000051c2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51C2 25336 bytes
SHA-256: f9e3e464d51825d047ab5f8bace69fda3b84e500b702fe11c25d20dad7898048
font_01_sfnt_off00008ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CA8 18764 bytes
SHA-256: a60c86c56966b468bd0b4738b84288df5a47ac46e5198cc9a200149fba9acfc9

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