Malicious PDF — malware analysis report

Static analysis result for SHA-256 278ae6a93da007af…

MALICIOUS

PDF

35.7 KB Created: 2021-07-05 14:42:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9200b48b7faff23d000b54deac403486 SHA-1: 2117cb6a73293e4050f7d28d5da7fff0cc55d5b6 SHA-256: 278ae6a93da007af90077a39fc1cd4946d3abeef861a4af02aa00bbbd8a91609
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising 'free game hacks' and 'unlimited spins' for popular games. The primary lure URL is http://netcdn.tw/app/406889139/free-coin-master-hacks-no-verification-or-survey-game-hack. This suggests the document is designed to trick users into visiting potentially harmful websites, likely for credential harvesting or further malware delivery.

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/free-coin-master-hacks-no-verification-or-survey-game-hack In PDF document text
    • http://library.stieyapan.ac.id/repository/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/getrobux-now_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/height-roblox-jump-hack_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-games-that-give-you-free-clothes_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-roblox-clothes-boy_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/roblox-its-free_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/minecraft-windows-10-edition-free-with-java_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free-spins-link-today-hack_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-drop-master-free_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-roblox-website_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-hack-roblox-accounts-in-game_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/robux-generator-no-verification-needed_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
stream_002_off00003291.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3291 23472 bytes
SHA-256: 53aa33b5165efa0f58579647c5f7cd87cc851794dadded73c3fc5f804721a70d
font_01_sfnt_off0000679c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x679C 18736 bytes
SHA-256: 5d883fbcba549dfc85d89aa60b08e322daf07c64f3e12c438afec793678b6e16