Malicious PDF — malware analysis report

Static analysis result for SHA-256 443d8b5090b6dc90…

MALICIOUS

PDF

44.5 KB Created: 2021-06-11 11:15:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0c9332a57e2fbfc7ddaf3ae6123f3eb0 SHA-1: bccffb52b4cf25d13ee0edfca8d1aa4fe377195f SHA-256: 443d8b5090b6dc90e3420a1eac78ee7401c90e2738dcad301bf9d52145a56103
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and websites offering game hacks and generators, such as 'free robux'. The ML classifier also flagged this PDF as malicious. The primary attack pattern involves luring users with promises of in-game advantages to click on these malicious URLs, which likely serve as a gateway to further malicious activity like malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/black-t-shirt-free-roblox-game-hack In PDF document text
    • https://lib.unitri.ac.id//repository/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/roblox-studio-free-download_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/robuxy-com-generator_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/minecraft-hacks-ps4_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-mod-apk-2021_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-download_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-free-pet-snacks_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-daily-free-spins-link-today-twitter_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/hacks-for-roblox-mac-that-works-with-overdrive_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/robux-hack-tools_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-robux-quiz_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-spin-online-tool-coin-master_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_off000050a1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50A1 24900 bytes
SHA-256: ed66f7fccfc25215951e039018962e152fa5c0f6cce55fcf8520ed5e73151e83
font_01_sfnt_off000089f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89F8 18736 bytes
SHA-256: 57ab7002e43f518e552ac61d8203fc82f64d7dea191784b2e4bfe1914df5a040

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