Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ff57c6fbace339…

MALICIOUS

PDF

42.0 KB Created: 2021-05-14 18:34:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 404b538093d947e6cfa0a192bb934673 SHA-1: 5b54d379bc81a97c2aa175c54c1555788a048b7c SHA-256: 40ff57c6fbace3392305162fc3b38976d223131dcd737372e3ed3ef4f565993c
200 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA and a download button lure, designed to trick the user into clicking a link. This link, https://netcdn.xyz/app/406889139/freespinandcoin-blogspot-game-hack, is identified as a malicious redirector. The document's content and heuristics suggest a social engineering attack aimed at users seeking game-related cheats or currency, ultimately leading them to potentially harmful infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/406889139/freespinandcoin-blogspot-game-hack In PDF document text
    • https://www.wcauk.org/uploads/files/files/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/get-minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/can-you-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-robux-offers_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/coin-master-link-for-spins_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/roblox-games-with-free-boombox_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/coin-master-free-spins-16-04-19_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/how-to-get-minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-realistic-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/vip-roblox-free_GM431946152.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • https://www.wcauk.org/uploads/files/files/roblox-heroes-online_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_off0000496c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x496C 24252 bytes
SHA-256: c23c85940f80098cf7b7bc995b44456a13b85ed4f3d9de2f35942d4b6ca32654
font_01_sfnt_off0000809f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x809F 18636 bytes
SHA-256: 39ad49e7f2f7b1e1661e6b5506a71ed4a13bb8570fb289ec0037d4e7a36d4803

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