Malicious PDF — malware analysis report

Static analysis result for SHA-256 34c4e185cd0c1314…

MALICIOUS

PDF

35.3 KB Created: 2021-07-05 13:06:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 7d6562b79d0f5d3d383261d93337cec3 SHA-1: 74e58e3b69a1b0126f34a00da284086cdaae647b SHA-256: 34c4e185cd0c131479aab74319a836d85cb9fbfcdafe70ca652e9041c9b33f06
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document contains a prominent link to 'netcdn.tw' which is associated with Coin Master free spins, a common lure for scams. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs and a visual download button heuristic further supports a malicious intent. Although no scripts were extracted, the overall structure and content suggest this PDF is designed to trick users into visiting a potentially malicious URL.

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-spin-facebook-link-game-hack In PDF document text
    • http://library.yamasi.ac.id/repository/minecraft-hacks-xbox-one_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/shirt-creator-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-daily-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/play-free-roblox-war-games_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-no-anything_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-rewards_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/minecraft-hacks-for-2b2t_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-roblox-builders-club-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/gaming-cheats-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/bux-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/music-hack-2021-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-no-verification-no-download_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_off0000312e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x312E 23604 bytes
SHA-256: 05305581a2adf4e2352e324f61d7b09d2135dde836e79b9904a5df59b6b95968
font_01_sfnt_off000066a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66A1 18504 bytes
SHA-256: 60d2bdc76bcd03856ff56843c76a1045165bedbcd3c7078909a454fabf5c0968

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