Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a0a40f2c3955ec…

MALICIOUS

PDF

34.2 KB Created: 2021-07-04 09:59:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c8763822e1467fae155b771a07f30184 SHA-1: 893b5efd965469fba21d82be1e8bc3c2525f5bcd SHA-256: 16a0a40f2c3955ecb7d108d77b5c0c7b42354eec78f5e3f983f79ba6f08eb883
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to a known malicious redirector, masquerading as a 'free generator' or 'game hack'. The document body and extracted URLs strongly suggest a lure for users seeking in-game currency or cheats for popular games like Roblox and Coin Master. The primary malicious URL, http://netcdn.tw/app/431946152/how-to-get-more-robux-game-hack, is likely used to deliver a second-stage payload or lead to a phishing page.

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.tw/app/431946152/how-to-get-more-robux-game-hack In PDF document text
    • https://fib.ub.ac.id/sac//repository/www-coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/mario-64-roblox-rom-hack_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/roblox-premium-free_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-cheat-for-rocitizens_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-hack-apk-35-11_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-free-spins-ios-app_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-game-free-download_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-apk-mods-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-spin-link_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-free-coins-hack_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-free-redeem-code_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-lumber-tycoon-hack_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/get-robux-com_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-with-inspect-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-hack-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/eroblox-promocodes-for-free-robux_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
font_00_sfnt_off00002ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ECB 22404 bytes
SHA-256: 65b744a27223a96e0b41d07dfe03e274f4724b6724dc1ed58d792586dbc4d8c8
font_01_sfnt_off00006064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6064 19016 bytes
SHA-256: 6aa127ff16da2a4872f87fb8bac29a815e7536eb149385d076fe202f8a47623a

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