Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c89f289e6e52aa…

MALICIOUS

PDF

41.3 KB Created: 2021-05-19 05:34:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d9f5a62f124b8a795d2ef59016cc97cf SHA-1: c72d78632fd22fe66f5ffd0258d6b7cdd9bf7552 SHA-256: b4c89f289e6e52aa485bc80dd69fa486c4026efb706cd1aa96c773e20a355005
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for 'free coins and spins' and links to a URL associated with game hacks. This heuristic, combined with the ML classifier, indicates a malicious intent to redirect users to potentially harmful content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/free-coins-and-spins-game-hack PDF link annotation
    • http://bit-sky.com/images/how-to-setup-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://bit-sky.com/images/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/hack-robux_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/coinmaster-blogspot_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/coin-master-hack-game-download-mod-apk_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/roblox-hacked-version_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • http://bit-sky.com/images/coin-master-online-hack-download_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/minecraft-free-app_GM479516143.pdfIn PDF document text
    • http://bit-sky.com/images/20-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/como-hackear-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/free-spin-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/free-minecraft-maps_GM479516143.pdfIn PDF document text
    • http://bit-sky.com/images/how-to-get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/is-minecraft-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_003_off00004911.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4911 24296 bytes
SHA-256: ec7a80e132d7b77e74f8cbfab826e7c3df3bbdadb9fac3190ee31a15a95afb9b
font_01_sfnt_off000080da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80DA 17728 bytes
SHA-256: e3d0b8926ee7e267670c6470891f76c6f1adfe71673e36adb63f096bfed3a95a

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