Malicious PDF — malware analysis report

Static analysis result for SHA-256 99cca544e313b1fd…

MALICIOUS

PDF

36.6 KB Created: 2021-06-18 03:50:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 351b488f131bd9f08d346e8a5d660f5b SHA-1: 668de9c46318b6877e1de9314df26dd59f36c0a4 SHA-256: 99cca544e313b1fd22af391eb8a16f45c099225c300adeb13b4bc5fe4c0ec53d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, masquerading as free game currency or hacks. The heuristic PDF_GAME_HACK_REDIRECT_LURE specifically identifies the lure content and the malicious redirector. While no scripts were extracted, the embedded URLs and the nature of the lure strongly suggest a phishing or scam attempt designed to lead users to potentially harmful sites.

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.co/app/431946152/free-robux-codes-2021-not-used-october-game-hack In PDF document text
    • http://perpus.masda.ac.id/repository/free-face-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/android-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-get-java-minecraft-free_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-avatar-tester_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-cheats-for-dead-rising-2_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-hacks-for-computer_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/minecraft-mod-updater_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/blox-best-robux_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-get-games-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-roblox-characters_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-dungeon-quest-rapist-hack_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-get-1-robux-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/vip-hack-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/easy-free-spins-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
font_00_sfnt_off00003615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3615 22720 bytes
SHA-256: 57d83fdf3599fb38b0051205db70506841f9149d9d04257b373953a479711bfe
font_01_sfnt_off000068cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68CC 19396 bytes
SHA-256: cb8cf37fcdc2e36d245ce21cac71f5229cd88cc382d6460ea32c27fe371376b4

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