Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2958f835d5f31c8…

MALICIOUS

PDF

43.8 KB Created: 2021-05-12 18:02:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 7ec811c347c2705d32236ed3303214f7 SHA-1: b6d744fe3b7a90203c4d6a6ef108359875a758fb SHA-256: f2958f835d5f31c84bf65130f00446d7ab38af2822e0b783db2a1200b6ce4838
200 Risk Score

Malware Insights

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

The PDF contains a link to a malicious redirector disguised as a game hack generator, which is designed to trick users into a fake CAPTCHA or verification prompt. The embedded URL, https://netcdn.xyz/app/431946152/how-do-you-get-roblox-for-free-game-hack, is the primary indicator of this malicious redirection. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's intended to exploit user interaction for further compromise, likely leading to a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/431946152/how-do-you-get-roblox-for-free-game-hack In PDF document text
    • https://gafaseo.com/images/coin-master-cheats-and-hacks_GM406889139.pdfIn PDF document text
    • https://gafaseo.com/images/how-to-download-wurst_GM479516143.pdfIn PDF document text
    • https://gafaseo.com/images/minecraft-114-download_GM479516143.pdfIn PDF document text
    • https://gafaseo.com/images/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • https://gafaseo.com/images/download-coin-master-hack-mod-apk_GM406889139.pdfIn PDF document text
    • https://gafaseo.com/images/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://gafaseo.com/images/how-to-get-real-robux_GM431946152.pdfIn PDF document text
    • https://gafaseo.com/images/hack-master-coin-pc_GM406889139.pdfIn PDF document text
    • https://gafaseo.com/images/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • https://gafaseo.com/images/free-minecraft-accounts-2021_GM479516143.pdfIn PDF document text
    • https://gafaseo.com/images/coin-master-free-spins-link-2021-ios_GM406889139.pdfIn PDF document text
    • https://gafaseo.com/images/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://gafaseo.com/images/coin-master-online-hack_GM406889139.pdfIn PDF document text
    • https://gafaseo.com/images/coin-master-fan-club_GM406889139.pdfIn PDF document text
    • https://gafaseo.com/images/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • https://gafaseo.com/images/best-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://gafaseo.com/images/rbx-claim_GM431946152.pdfIn PDF document text
    • https://gafaseo.com/images/gamehunters-club-coin-master_GM406889139.pdfIn PDF document text
    • https://gafaseo.com/images/free-shirt-roblox_GM431946152.pdfIn PDF document text
    • https://gafaseo.com/images/coin-master-free-spins-2021-hack_GM406889139.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_off000048e2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48E2 27428 bytes
SHA-256: b17ed9101fdad41a1dbd8e21cf890a51adc9d6e9c2beb1c301994adc8c5ae787
font_01_sfnt_off000087b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87B7 18688 bytes
SHA-256: c319980467b8bcea808cf7446b1cb0422dd1c28f9b99e7a79dce679e259df094

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