Malicious PDF — malware analysis report

Static analysis result for SHA-256 72f95a1cf0da24fa…

MALICIOUS

PDF

45.7 KB Created: 2021-06-10 20:54:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 02780b44a4c6db97398f44842cc6347c SHA-1: 0853bb63f1536091ec160c65478a5e76abffc16b SHA-256: 72f95a1cf0da24fafc0e646e51e28aa12a602d92a7e8f592119b6070dc637d75
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a "free generator / game hack" which redirects to malicious infrastructure. The embedded URL `https://netcdn.tw/app/431946152/free-robux-guide-game-hack` is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it is designed to trick users into visiting potentially harmful 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-guide-game-hack In PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/coin-master-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/free-minecraft-java-edition-account_GM479516143.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/coin-master-free-spins-no-survey_GM406889139.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/win-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/how-to-get-free-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/unendlich-robux-hack_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/free-minecraft-account-reddit_GM479516143.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/how-to-get-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/coin-master-hack-apk-35-18_GM406889139.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/coin-master-heaven-links-free-spins_GM406889139.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/how-to-get-100-robux-for-free_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/free-coin-master-spin-app_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_off0000505f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x505F 27756 bytes
SHA-256: b578ba30a8a5c8b0f6abd26217f959bd8bff2929aaac75446b184804d7f06909
font_01_sfnt_off00009012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9012 18308 bytes
SHA-256: ab13b8b8f8525fd90b69d597b64d32979eb63c9151d32e071301006b03ed849c

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