Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa13a817c4fcf131…

MALICIOUS

PDF

47.5 KB Created: 2021-05-11 21:02:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b0a76b48d418463519ef60526e229185 SHA-1: fb77b071b29c5d42f259267f15e28cd4d0c004fd SHA-256: aa13a817c4fcf13146162ad1b923f4d07c8992fb5e09b0a7a3e9ff576920ba77
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded URLs and a document body that attempts to trick the user into downloading a file by offering free games or in-game currency. The ML classifier also flagged this PDF as malicious. The primary URL identified is https://netcdn.xyz/app/479516143/free-games-like-minecraft-game-hack, which likely serves the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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.xyz/app/479516143/free-games-like-minecraft-game-hack In PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/free-roblox-accounts-with-builders-club_GM431946152.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/how-to-hack-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/i-want-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/202100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/how-to-get-coin-master-card-free_GM406889139.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/coin-master-time-hack-ios_GM406889139.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/coin-master-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/mcpe-master-hack-unlimited-coins-latest-version_GM406889139.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
    • http://repository.poltekkesjakarta3.ac.id/repository/www-free-robux-com_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b60.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B60 29984 bytes
SHA-256: 98c4f18d588449b52debc1f8edf7f8bca4e0b38cc097f831f1c8277de7f59bf8
font_01_sfnt_off00008de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DE9 3056 bytes
SHA-256: dd24a0ab94df4552e459bd06fd01b0fd3f021c1d51d1d64407070e735974a028
font_02_sfnt_off0000985c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x985C 17996 bytes
SHA-256: 6316af01e653c53aa8313e9ee065e63d320a9dd1c98e4ac08eccbec55cd1c79a

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