Malicious PDF — malware analysis report

Static analysis result for SHA-256 9abd130f10c6a1c8…

MALICIOUS

PDF

35.0 KB Created: 2021-07-03 13:35:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 86fc825ca0d79910b1989f1ca42eab6f SHA-1: 4cf65539ba37e56f96be8e2a24d8706b5d7d71ec SHA-256: 9abd130f10c6a1c8ba93bae545bf76f85b4198d870877e2ba6abb3fa20225842
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a "Coin Master Hack" and embeds multiple URLs, including one pointing to netcdn.tw, which is likely intended to host a malicious payload. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lure suggest a phishing or social engineering attack aimed at tricking users into downloading further malware.

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-hack-with-facebook-login-game-hack In PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-free-foxy-food_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/free-card-collection-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/coin-master-daily-free-cards_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-builders-club-accounts-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/www-roblox-com-robux_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/worst-roblox-avatars_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-get-robux-on-roblox-no-hacks_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/how-to-get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/free-minecraft-skins-girl_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/minecraft-free_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-hacksco_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/roblox-cheat-engine-cheats_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-spin-link_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/free-robux-co_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-executors-for-roblox_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/when-alone-roblox-has-been-released-for-free_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-get-free-robux-no-downloading-games_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_off0000310f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x310F 23068 bytes
SHA-256: 03fdf84cd73b4bb051be4e859116fd344c4f52fa4596c8b5e9f7bb6e3423bc3b
font_01_sfnt_off00006518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6518 18688 bytes
SHA-256: e9ace80da0f9d8e117a2645a35dad65ee376e43c425a8643661d0397b324af80

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