Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c1931fe3d2276e…

MALICIOUS

PDF

47.4 KB Created: 2021-06-04 00:50:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8d4e94077a1b2dc3667644025bd7430a SHA-1: 7e798f53c3d2cdddfb00f3406cc0dcf4da3e38be SHA-256: b0c1931fe3d2276e9e6101224ba34f1a1915f4fd4eeb0cc8c347e07252bab892
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users into clicking on what appears to be a free generator or hack for games. One of the primary links, 'https://netcdn.online/app/431946152/free-robux-cards-game-hack', is flagged as malicious redirector infrastructure. The document body and numerous extracted URLs reinforce this lure, pointing to various game-related hacks and free currency. No scripts were extracted, but the embedded links and the nature of the lure suggest a phishing or scam attempt.

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/431946152/free-robux-cards-game-hack In PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/how-to-get-free-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/apk-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/hack-minecraft_GM479516143.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/free-robux-generator_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/free-magical-chest-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/how-to-change-your-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/how-to-get-gold-cards-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-hack-tool-apk-download_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/roblox-arsenal-hacks-download_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/free-bling-bling-card-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/free-spins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/play-minecraft-online-free_GM479516143.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/free-spins-coin-master-cheat_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/coin-master-hacks-2021_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/wwwcoin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/minecraft-linux-free_GM479516143.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/free-minecraft-generator_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
font_00_sfnt_off0000518f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x518F 25468 bytes
SHA-256: 2e7f1cbf0fcbb24e2f3dfb52f8abf7d14ff513de863abf9e65904e2f5cfd20c4
font_01_sfnt_off00008c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C57 2824 bytes
SHA-256: 1d0cb1023eaa225682b8e7a2c8df4e4c96545ba7eedaf3d9844e51183e9ca189
font_02_sfnt_off00009604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9604 18416 bytes
SHA-256: 79c56a0f23d4fc34690a575a065be14b64911c3c5a3331038291264b4b7107af

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