Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75cdf42b63d8a30…

MALICIOUS

PDF

35.1 KB Created: 2021-07-06 15:09:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ebb9293e3003af0bd8a547ec8cad006f SHA-1: 324ba6acd071714fe1cdbb5b2e0e6b4ccb72956c SHA-256: c75cdf42b63d8a30a22d5ed0d9e7d94f9b54d0a5d257340f5083f768ab2da856
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generators' and 'game hacks' for popular games. The primary lure URL is http://netcdn.tw/app/406889139/get-coin-master-spins-free-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering attack aimed at tricking users into visiting potentially harmful sites, 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/get-coin-master-spins-free-game-hack In PDF document text
    • https://sponajaib.com/ckfinder/userfiles/files/free-headphones-in-roblox_GM431946152.pdfIn PDF document text
    • https://sponajaib.com/ckfinder/userfiles/files/free-robux-20219_GM431946152.pdfIn PDF document text
    • https://sponajaib.com/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • https://sponajaib.com/ckfinder/userfiles/files/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • https://sponajaib.com/ckfinder/userfiles/files/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://sponajaib.com/ckfinder/userfiles/files/roblox-clover-online-hack_GM431946152.pdfIn PDF document text
    • https://sponajaib.com/ckfinder/userfiles/files/tiktok-free-app-download_GM835599320.pdfIn PDF document text
    • https://sponajaib.com/ckfinder/userfiles/files/coin-master-hack-online_GM406889139.pdfIn PDF document text
    • https://sponajaib.com/ckfinder/userfiles/files/minecraft-free-download-android_GM479516143.pdfIn PDF document text
    • https://sponajaib.com/ckfinder/userfiles/files/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • https://sponajaib.com/ckfinder/userfiles/files/toolbox-for-mcpe_GM479516143.pdfIn PDF document text
    • https://sponajaib.com/ckfinder/userfiles/files/how-to-hack-favorites-on-game-roblox_GM431946152.pdfIn PDF document text
    • https://sponajaib.com/ckfinder/userfiles/files/roblox-hacks-leak-forums_GM431946152.pdfIn PDF document text
    • https://sponajaib.com/ckfinder/userfiles/files/free-modded-minecraft-server_GM479516143.pdfIn PDF document text
    • https://sponajaib.com/ckfinder/userfiles/files/free-tiktok-likes-generator_GM835599320.pdfIn PDF document text
    • https://sponajaib.com/ckfinder/userfiles/files/how-to-get-roblox-bloxburg-free_GM431946152.pdfIn PDF document text
    • https://sponajaib.com/ckfinder/userfiles/files/roblox-walkspeed-hack-cheat-engine_GM431946152.pdfIn PDF document text
    • https://sponajaib.com/ckfinder/userfiles/files/coin-master-how-to-get-japan-sushi-card-free_GM406889139.pdfIn PDF document text
    • https://sponajaib.com/ckfinder/userfiles/files/roblox-free-items-september-2021_GM431946152.pdfIn PDF document text
    • https://sponajaib.com/ckfinder/userfiles/files/free-roblox-accounts-whit-gamepasses_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_off0000333d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x333D 23036 bytes
SHA-256: 14ea0759479827548be21626927e487934689dc6edd551e6ae028ebc1895ee32
font_01_sfnt_off000066d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66D4 18176 bytes
SHA-256: 3c1755862e9d7b6c118913672ec91aceec4079bd066dd8ef58651bb045fdbbfe

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