Malicious PDF — malware analysis report

Static analysis result for SHA-256 51fa82ac3d142d1d…

MALICIOUS

PDF

43.3 KB Created: 2021-06-03 06:38:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d1aca3f2df7f8b2a21976f5fc9c83cbc SHA-1: 9def3f9ecffe5bceb58f8f392498db95930b876f SHA-256: 51fa82ac3d142d1df4b9952db9577b3167b3d4738e2c60470ffb14d662368288
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 https://netcdn.online/app/406889139/free-coin-master-spins-and-coins-game-hack PDF link annotation
    • https://razredna-nastava.net/files/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-coins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/earn-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-adopt-me-hack_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/freespinandcoin-blogspot_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-robux-site_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-mod-apk-latest-version-free-download_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/static-moonactive-net-link_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-15-free-spin-link-today_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/hack-coin-master-spin-android_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/inappropriate-roblox_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-tiktok-likes-and-followers_GM835599320.pdfIn PDF document text
    • http://razredna-nastava.net/files/minecraft-for-ipad-free_GM479516143.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_004_off00005047.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5047 24276 bytes
SHA-256: ef3663f1d3303379b292e37403432e75f7446c3c1db6b06ea3c5fff7141ab804
font_01_sfnt_off0000874e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x874E 18060 bytes
SHA-256: 55f53c4f18bfaf59a8fbb6d381f980c96a3f4ad908aa3278e43a985984e68094

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