Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad7fe8ac6761460…

MALICIOUS

PDF

47.0 KB Created: 2021-06-03 07:52:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3fbe13e79f98829195ce5b853e3ac25a SHA-1: 12bc6f9b209afefd0980fc67b65466426350bb65 SHA-256: 5ad7fe8ac6761460f0e3401ddee0ca973a11066b9e1c96956e2ddaf77845fc1f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to redirector infrastructure, specifically advertising 'free generator / game hack' content. These links likely lead to the download of a second-stage payload. The ML classifier also flagged this PDF as malicious, increasing confidence in its malicious intent. No scripts were extracted from this sample.

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/coin-master-gold-cards-free-2021-game-hack In PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-spins-coin-master-october-13-2021_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/mine-minecraft-games-for-free_GM479516143.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/what-is-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/roblox-getting-hacked_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/minecraft-svg-free_GM479516143.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/moon-active_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/roblox-free-draw_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-hack-program_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/roblox-hack-site_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-5-tiktok-likes_GM835599320.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-robux-please_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/claimrobux-net_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/roblox-piano-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/roblox-robux-generator-http-freerobuxgenerator-xyz_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-bling-bling-card-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coin-master-free-spins-gratis_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/tiktok-for-free_GM835599320.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_off00004de3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DE3 26784 bytes
SHA-256: 5e359ad09316f21ad4035af3ac575265a3c8865a6af76e524c756a434096be9b
font_01_sfnt_off00008ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AB6 2912 bytes
SHA-256: 4d2d01e532dab87c93543525a5a2ee64da67df838e8d2c9aa435af102cbf2dac
font_02_sfnt_off000094c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94C5 18360 bytes
SHA-256: d5f784e8d5b6a4d28f0062806331642ef98a482c4c05a0dd4c725f7b2a97d1be

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