Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f6db20d416a2d52…

MALICIOUS

PDF

33.9 KB Created: 2021-07-05 16:20:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: acc0bc11fa604f8e8074a1aaabb960ff SHA-1: 33469d858c3822c0cd7b41f78584d70bb3d2ac28 SHA-256: 9f6db20d416a2d524d8ebccea37f5d82e82b49d5453f14e24bffed553e870d81
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one to 'netcdn.tw', which is flagged as a known malicious redirector. The document body and heuristics indicate a lure for game hacks or generators, aiming to trick users into visiting this malicious infrastructure. No scripts were extracted, but the embedded URLs and heuristic firings strongly suggest a phishing or redirection attack.

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-mod-apk-game-hack In PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/roblox-com-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/free-unlimited-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/rewards-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/free-coin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/coin-master-card-hack-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/100-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/roblox-piano-music-sheet-megalovania-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/5-roblox-games-that-give-you-free-robux-working_GM431946152.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/roblox-skins-boy-free_GM431946152.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/tiktok-free-folowers-online_GM835599320.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/roblox-bux-free_GM431946152.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/free-robux-generator-2_GM431946152.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/free-robux-script_GM431946152.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/www-coin-master-hack-com_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
stream_002_off00002f1f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F1F 22488 bytes
SHA-256: 11ec56464d15f0688de768179bcd24dbabcea8ff05db70fd2200226445cbe08a
font_01_sfnt_off0000614f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x614F 18352 bytes
SHA-256: 8921705bb0180ef928bfc54a8bff441144a325a835df77ae2345570de02769c4

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