Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d9d417d0227b21…

MALICIOUS

PDF

45.3 KB Created: 2021-06-01 14:15:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e86d85d5a1bd5d9b14b1dd3f770b26c2 SHA-1: a3c6be81101edfc9aa696f64ef4f2cbb4ee8b1ec SHA-256: 23d9d417d0227b21151407aa00d0469011893d927c351ffcdeeb306f5423dcb6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to known malicious infrastructure, specifically promoting 'free generators' and 'game hacks' for popular games like Roblox. The ML classifier also flagged this PDF as malicious. The presence of these lures and the redirection to potentially harmful sites indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/431946152/free-roblox-robux-generator-no-human-verification-or-survey-game-hack In PDF document text
    • https://www.sbmc.in/wp-content/uploads/fsqm-files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://www.sbmc.in/wp-content/uploads/fsqm-files/roblox-cheat-table-for-cheat-engine_GM431946152.pdfIn PDF document text
    • https://www.sbmc.in/wp-content/uploads/fsqm-files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.sbmc.in/wp-content/uploads/fsqm-files/hacks-para-juegos-de-roblox_GM431946152.pdfIn PDF document text
    • https://www.sbmc.in/wp-content/uploads/fsqm-files/how-to-make-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://www.sbmc.in/wp-content/uploads/fsqm-files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.sbmc.in/wp-content/uploads/fsqm-files/free-minecraft-java-edition_GM479516143.pdfIn PDF document text
    • https://www.sbmc.in/wp-content/uploads/fsqm-files/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.sbmc.in/wp-content/uploads/fsqm-files/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://www.sbmc.in/wp-content/uploads/fsqm-files/roblox-brown-free-hair-boy_GM431946152.pdfIn PDF document text
    • https://www.sbmc.in/wp-content/uploads/fsqm-files/get-minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • https://www.sbmc.in/wp-content/uploads/fsqm-files/roblox-saob-hack_GM431946152.pdfIn PDF document text
    • https://www.sbmc.in/wp-content/uploads/fsqm-files/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.sbmc.in/wp-content/uploads/fsqm-files/free-tiktok-followers-without-verification_GM835599320.pdfIn PDF document text
    • https://www.sbmc.in/wp-content/uploads/fsqm-files/how-to-get-20210-robux-on-roblox-free_GM431946152.pdfIn PDF document text
    • https://www.sbmc.in/wp-content/uploads/fsqm-files/free-robux-no-apps-needed_GM431946152.pdfIn PDF document text
    • https://www.sbmc.in/wp-content/uploads/fsqm-files/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • https://www.sbmc.in/wp-content/uploads/fsqm-files/roblox-pokemon-brick-bronze-cheats-for-victini_GM431946152.pdfIn PDF document text
    • https://www.sbmc.in/wp-content/uploads/fsqm-files/free-tiktok-followers-no-downloads_GM835599320.pdfIn PDF document text
    • https://www.sbmc.in/wp-content/uploads/fsqm-files/you-promised-my-son-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
stream_004_off000052cc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52CC 25296 bytes
SHA-256: 1c3d3252c08f4ac730c84f46929820ea0ff7894b2454129dd03711cc0568a294
font_01_sfnt_off00008bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BDE 19228 bytes
SHA-256: e2792bb4b94dc3a0ec1670020eb938d731a3f06c477f45d1a0bfcce5f56c2842

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