Malicious PDF — malware analysis report

Static analysis result for SHA-256 f110c4ab86611c00…

MALICIOUS

PDF

46.3 KB Created: 2021-05-14 06:16:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6145e8258d4979d38fd95a6d827c4b67 SHA-1: 65ca504e680319249d7d4f4b0a274b7c8443df39 SHA-256: f110c4ab86611c0061923d8f8e602fca58feaeabac291fc59feaa017a44c5bbd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, specifically advertising 'free generators' and 'game hacks' for popular games. The primary malicious link identified is https://netcdn.xyz/app/406889139/coin-master-free-spins-daily-1-ga-game-hack, which is flagged as a known malicious redirector. The document body, though partially corrupted, contains references to this URL and other similar lures. The presence of multiple embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8696

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.xyz/app/406889139/coin-master-free-spins-daily-1-ga-game-hack In PDF document text
    • http://www.notaioricci.it/images/minecraft-free-no-download_GM479516143.pdfIn PDF document text
    • http://www.notaioricci.it/images/robux-without-verification_GM431946152.pdfIn PDF document text
    • http://www.notaioricci.it/images/coin-master-pc-game-free-download_GM406889139.pdfIn PDF document text
    • http://www.notaioricci.it/images/coin-master-free_GM406889139.pdfIn PDF document text
    • http://www.notaioricci.it/images/hack-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.notaioricci.it/images/free-robux-today_GM431946152.pdfIn PDF document text
    • http://www.notaioricci.it/images/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • http://www.notaioricci.it/images/hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.notaioricci.it/images/coin-master-hack-version-2021-download_GM406889139.pdfIn PDF document text
    • http://www.notaioricci.it/images/free-robux-safe_GM431946152.pdfIn PDF document text
    • http://www.notaioricci.it/images/free-minecraft-mods-for-xbox-one_GM479516143.pdfIn PDF document text
    • http://www.notaioricci.it/images/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.notaioricci.it/images/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • http://www.notaioricci.it/images/watch-ads-for-robux_GM431946152.pdfIn PDF document text
    • http://www.notaioricci.it/images/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • http://www.notaioricci.it/images/blox-pink-robux-free_GM431946152.pdfIn PDF document text
    • http://www.notaioricci.it/images/robux-free-2021_GM431946152.pdfIn PDF document text
    • http://www.notaioricci.it/images/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://www.notaioricci.it/images/coin-master-tricks_GM406889139.pdfIn PDF document text
    • http://www.notaioricci.it/images/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ae8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AE8 29132 bytes
SHA-256: 05f34f28427eedbb80c0ac42f376bde0e9d2c1be06fd8c41ffa302099cbd8630
font_01_sfnt_off00008863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8863 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00009215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9215 18412 bytes
SHA-256: a4e4e22dbaa1ba591ad8cf5651117adb3a59ec3d16463c49762e7e89c9509709

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