Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d73a9a7cab15bf5…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 11:17:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: faf1863bffdbf3f07b23cce713a20989 SHA-1: 4c89157b9fa61b9a63155fb3b48ac84a04740546 SHA-256: 8d73a9a7cab15bf5d57bbb29c95197965b8e7d44d3faa9e64f2c4f9fbde97794
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it links to malicious redirectors and is designed as a lure for game hacks. The primary URL, http://netcdn.tw/app/406889139/hack-coin-master-apk-mod-game-hack, is identified as a malicious redirector. The document body, though partially corrupted, contains similar URLs and text suggesting a scam related to game cheats or currency.

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/hack-coin-master-apk-mod-game-hack In PDF document text
    • http://www.digilib.uim.ac.id/repository/roblox-website-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-games-to-play-for-free_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/rewards-robux_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/get-minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/minecraft-pocket-edition-free-ios_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-hack-into-peoples-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-reddit_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/when-pubg-uc-available_GM1330123889.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-event-hack_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-do-you-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/pokemon-go-free-roam-hack_GM1094591345.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-android_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/apps-to-get-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_off000032e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32E7 22588 bytes
SHA-256: 5811b739c590469862edf1764e5ebeca70d84c35ce6409877575b3bc2f20937d
font_01_sfnt_off00006550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6550 18352 bytes
SHA-256: cbc4e4e1d1bb734107fc5d409ab149651d88467a261092654a59e8786ea3a6d0

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