Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b86c4417dd484a1…

MALICIOUS

PDF

47.5 KB Created: 2021-06-04 00:26:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5c8e6deb4c741ba06e5ea3d4134fa3cb SHA-1: 6f92e9453bba3d7fb767a85247dd7b69bf23d247 SHA-256: 1b86c4417dd484a1594ee9500f30966bb4061450e18e5e828fca5fb37b8a8b47
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including one identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to game hacks and free in-game currency. The presence of 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 0.9769

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/how-to-send-free-spins-on-coin-master-game-hack In PDF document text
    • http://lib.stimykpn.ac.id//repository/free-game-packs-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coins-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-do-you-get-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-spins-for-free_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-robux-pins_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-links-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/minecraft-auto-miner-hack_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-minecraft-for-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/minecraft-story-mode-free-download_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/gamehunters-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-hack-version-download-2021-android_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-free-spins-daily-fb-champion_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/roblox-premium-free_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/aimbot-download-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/113-hacked-client_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/minecraft-logo-maker-free_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/minecraft-pocket-edition-download-free-pe-calculator_GM479516143.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_004_off000050e0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50E0 25628 bytes
SHA-256: 78a1b88fd572673b7994510aec2662ffb6196382caeb8beec9307b1ce6b5e148
font_01_sfnt_off00008b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B9A 3460 bytes
SHA-256: 7f0b48eec8e6fd5b18d168c9ddbcaf2fa2459a2caa093712ac32cf07a4771a7d
font_02_sfnt_off00009706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9706 18224 bytes
SHA-256: d00f7bd7e6d98a9c881f31d4bf80def427e9c83cb097cf2f19ca8a4d4a08bd16

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