Malicious PDF — malware analysis report

Static analysis result for SHA-256 b24de1b25febc614…

MALICIOUS

PDF

42.8 KB Created: 2021-05-17 21:10:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 77ab09ae110ee12214b702b5ece1e6bd SHA-1: 2e4211db017739d42a83c77b7430db511f943ee8 SHA-256: b24de1b25febc614012347d61cb0a590d34e35b42390c8b873b30982022c7b5c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and websites offering 'free Robux' or game hacks, indicating a lure-based attack. The ML classifier strongly flagged this PDF as malicious. The embedded links likely lead to further malicious content or downloads, aiming to compromise the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/ways-to-get-free-robux-game-hack In PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/free-robux-apk_GM431946152.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/minecraft-free-download-chromebook_GM479516143.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/free-robux-website_GM431946152.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/minecraft-auto-miner-hack_GM479516143.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/free-minecraft-servers-to-join_GM479516143.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/coin-master-free-spins-link-2021-app_GM406889139.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/minecraft-free-apk_GM479516143.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/free-roblox-codes_GM431946152.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/free-minecraft-server-hosting-with-plugins_GM479516143.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/freegames911com-coinmastertipsandcheats2021freecoinsandspins_GM406889139.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/free-admin-roblox_GM431946152.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/static-moonactive-net-rewards-2021_GM406889139.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/how-to-get-free-roblox-hair_GM431946152.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/games-that-give-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_003_off0000487c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x487C 25316 bytes
SHA-256: 1fcaa1cdb55f1ab2547d51a90fc26e208cc17d88a2bf27129d0941a3e035d76f
font_01_sfnt_off00008361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8361 18724 bytes
SHA-256: b2cd5ec598a8c260812e966e9710fb38f03066217a6d0ec8f431d8a9dca8af42

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