Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b67a92e4dde33e…

MALICIOUS

PDF

35.7 KB Created: 2021-07-01 06:19:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: bc9a0e765a1427909d6cf0db876f18bd SHA-1: 67f0c08812bbb03584cc576fd5d8e8e27caa7a4e SHA-256: c5b67a92e4dde33eddfc8436f69925f9003f9af75ab9d4edcc7c9e3111832fa1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising 'free generators' or 'game hacks'. The presence of these links and the ML classifier's high confidence score indicate a malicious intent to lure users to potentially harmful websites. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/rbx-website-game-hack In PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/can-you-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/www-free-robux_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/freespinandcoin-blogspot-com_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/rbx-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-robux-place_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/best-all-round-roblox-gui-script-hack_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/100-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/how-to-make-a-modded-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-free-500-spins-link_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/robux-hack-no-app-download_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/how-to-be-able-to-open-cheat-engine-in-roblox_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/como-ser-hacker-en-roblox-en-grand-blox-auto_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/minecraft-bedrock-free-with-java_GM479516143.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/promo-code-free-robux_GM431946152.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
font_00_sfnt_off000034fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34FC 22696 bytes
SHA-256: 998976a41c3583079cc905d4d4e703786469589913d001c86a2ede99b75dbf46
font_01_sfnt_off000067a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67A3 18692 bytes
SHA-256: 2ab50234571f512cd2d42beb59b2e3c1242ee2e526b3c47677cfc213058ef371

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