Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd6c808df4779f9…

MALICIOUS

PDF

34.5 KB Created: 2021-07-04 00:04:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 34eec11be87bd94610e64755e65f13ad SHA-1: ac32485b671b13bf88d8255f4fd50758f88ee2a0 SHA-256: ffd6c808df4779f997def5ca6e555a42496a177c1c960c97d7464e33242d1628
160 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it links to malicious redirector infrastructure, specifically advertising a "free generator / game hack" for Coin Master. The embedded URL `http://netcdn.tw/app/406889139/coin-master-free-spins-link-2021-iphone-game-hack` is identified as a malicious redirector. The document's content and structure strongly suggest a lure to a scam or malware distribution site, masquerading as a game cheat.

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/406889139/coin-master-free-spins-link-2021-iphone-game-hack In PDF document text
    • http://digilib-ppsunisma.ac.id/repository/how-to-get-free-robux-by-joedaddy_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/is-there-a-free-way-to-earn-robux_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/coin-master-villages_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/roblox-isername-change-free_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/youtube-free-roblox-account_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/get-free-robux-no-survey-2021_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/how-ro-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-robux-2021-no-survey-or-verification_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/how-to-get-coins-on-tiktok-for-free_GM835599320.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/gear-hack-roblox_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/unlimited-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/roblox-hacked_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/cheat-fr-roblox_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/get-free-robux-mobile-app_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/code-for-roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/roblox-sign-in-free-online_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/roblox-account-hack-app_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/aex-hack-roblox_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/neil-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-account-roblox-2021_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_off0000300f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x300F 22588 bytes
SHA-256: 34e6ebad4cfa81a36a9ebe64a53ed0f20b8481143383b9769b4df36d007f7062
font_01_sfnt_off00006266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6266 18912 bytes
SHA-256: ed7734439a816b2bd891e5f24a4801f1123b0357f1ab5ccb15a9d60073fcd78d