Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf2d8665c0a6d840…

MALICIOUS

PDF

34.9 KB Created: 2021-07-07 21:10:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 654575565c940072050e73e780ea3dde SHA-1: 0949e2636cbdbdba466f8db6782ef2cb5ec68a6c SHA-256: cf2d8665c0a6d840e153ce5a0f91bdf01b7d77f54cff0150fa8f4b602c24f74f
160 Risk Score

Malware Insights

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

The PDF contains a lure for free game currency, specifically mentioning 'Robux', and links to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the malicious redirector URL, which likely leads to a further stage of compromise.

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.tw/app/431946152/codes-to-get-free-robux-game-hack In PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/roblox-wizard-tycoon-hack_GM431946152.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/instant-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/free-spins-and-coins-com_GM406889139.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/free-minecraft-mods-for-ps4_GM479516143.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/coin-master-latest-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/free-robux-scam_GM431946152.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/minecraft-pc-download-free-full-version_GM479516143.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/coin-master-free-food-for-pet_GM406889139.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/tiktok-free-8-ball-pool_GM835599320.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/roblox-promo-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/working-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/roblox-online-free-play-now_GM431946152.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/roblox-script-hack_GM431946152.pdfIn PDF document text
    • https://www.cgalgeria-dubai.com/userfiles/files/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3213 22356 bytes
SHA-256: 553f893bdb56be5ebf46b1db046c827cacbf7ea7109602622bcd5903f78e549b
font_01_sfnt_off0000637b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x637B 18996 bytes
SHA-256: dae15d86f19837a25368e9980f7c547d0fc236531c79ecd70a0408dcd8fbc7fb

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