Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bb415f1d5c0d4c6…

MALICIOUS

PDF

45.5 KB Created: 2021-06-03 13:53:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b6beccb34b848ba90d71c15e310daf74 SHA-1: ec28b87d108db669a29d1763bdfe544fbc5e3275 SHA-256: 0bb415f1d5c0d4c671f006994d2b08f2eddb3aafe97ea4d67d366a74af5272cf
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to what is identified as malicious redirector infrastructure, specifically promoting 'game hacks' and 'free spins'. The document body, though partially corrupted, contains a URL that is also flagged as malicious. This suggests the primary goal is to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.online/app/406889139/coin-master-daily-gift-free-spins-and-coins-link-game-hack In PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-spin-and-coins-links-home_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/http-appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/can-you-really-hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/robux-game_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-pocket-apk_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/roblox-free-play_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-games-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/real-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-app-store-free_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/how-to-get-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/minecraft-windows-10-hack-client-2021_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/how-do-you-get-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-do-you-install-minecraft-for-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_off000052c8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52C8 25984 bytes
SHA-256: 1a5509a7f902f1952368d3d86d7081280608c000f3ce79fa49f59af9a7866b25
font_01_sfnt_off00008e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E23 18652 bytes
SHA-256: 366d9c9b3cd0388843e044af578ba3ade018a9e96efb4083e0cc5bdd66e71c38

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