Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a56f4e764dda94…

MALICIOUS

PDF

43.8 KB Created: 2021-05-12 03:13:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: df8fa37148743bc5216cf4314d33705e SHA-1: 6c5bbbdcf9fc7a1f65e84af77d3fc4a2a81f61f8 SHA-256: b7a56f4e764dda9495ed9a376a59a2b6caf2bd63eb09a1a6527d8308fa89c7a3
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that redirect to sites offering game hacks and free items, a common lure for phishing or malware distribution. The ML classifier strongly indicated maliciousness, and the heuristics confirm the use of a redirector for a 'game hack' lure. Although no scripts were explicitly extracted, the nature of the embedded URLs suggests a potential for further malicious actions, such as downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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-spins-coin-master-without-completing-offers-game-hack PDF link annotation
    • http://librarystkippgribl.com/repository/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/minecraft-pe-017-0-apk-free-download-android_GM479516143.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/minecraft-pocket-edition-free-download_GM479516143.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/coin-master-free-spins-glitch_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/open-coin-master_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/minecraft-free-download-unblocked_GM479516143.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/coin-master-unlimited-spins-hack_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/free-coin-master-spins-2021-link_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/coin-master-app_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/free-robux-app-real_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/coin-master-hoe-to-get-extra-free-spins_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/minecraft-survival-free_GM479516143.pdfIn PDF document text
    • http://librarystkippgribl.com//repository/daily-coin-master-free-spin-link-facebook_GM406889139.pdfIn PDF document text
    • http://librarystkippgribl.com/repository/moonactive-coin-master-free-spins-link_GM406889139.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_off00004c3b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C3B 25368 bytes
SHA-256: 376be6b47b532f7f5bca4af920f912cb6d97585628d3926208ce79b2001364be
font_01_sfnt_off00008728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8728 19012 bytes
SHA-256: 94ec3d6dd7afe22736a4406c77b2a22b2801cceff0f201dfa37f6b15e40fa38c

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