Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa88f520e58e6676…

MALICIOUS

PDF

44.7 KB Created: 2021-05-17 10:51:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-06
MD5: 1a58a74cc1a1f75ab4638743818fe528 SHA-1: 5f582b347593e24429c3038e3f3cac2c950ce314 SHA-256: aa88f520e58e6676b5e4f31126dba70268d912d59d5f892e130c28c1f3538ccd
160 Risk Score

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 https://netcdn.xyz/app/431946152/free-robux-kid-friendly-no-human-verification-game-hack In PDF document text
    • https://www.medlinerecruitment.com/uploaded_files/userfiles/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.medlinerecruitment.com/uploaded_files/userfiles/files/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.medlinerecruitment.com/uploaded_files/userfiles/files/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • https://www.medlinerecruitment.com/uploaded_files/userfiles/files/coin-master-free-link_GM406889139.pdfIn PDF document text
    • https://www.medlinerecruitment.com/uploaded_files/userfiles/files/free-minecraft-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • https://www.medlinerecruitment.com/uploaded_files/userfiles/files/coin-master-free-spins-link-no-verification_GM406889139.pdfIn PDF document text
    • https://www.medlinerecruitment.com/uploaded_files/userfiles/files/coin-master-village-cost_GM406889139.pdfIn PDF document text
    • https://www.medlinerecruitment.com/uploaded_files/userfiles/files/coin-master-hack-unlimited-spins-apk-download_GM406889139.pdfIn PDF document text
    • https://www.medlinerecruitment.com/uploaded_files/userfiles/files/coin-master-free-link-app_GM406889139.pdfIn PDF document text
    • https://www.medlinerecruitment.com/uploaded_files/userfiles/files/coin-master-official-fan-page_GM406889139.pdfIn PDF document text
    • https://www.medlinerecruitment.com/uploaded_files/userfiles/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.medlinerecruitment.com/uploaded_files/userfiles/files/free-robux-real_GM431946152.pdfIn PDF document text
    • https://www.medlinerecruitment.com/uploaded_files/userfiles/files/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
    • https://www.medlinerecruitment.com/uploaded_files/userfiles/files/hacked-roblox-accounts-list_GM431946152.pdfIn PDF document text
    • https://www.medlinerecruitment.com/uploaded_files/userfiles/files/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • https://www.medlinerecruitment.com/uploaded_files/userfiles/files/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://www.medlinerecruitment.com/uploaded_files/userfiles/files/how-do-i-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.medlinerecruitment.com/uploaded_files/userfiles/files/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://www.medlinerecruitment.com/uploaded_files/userfiles/files/free-spin-appscoin-master_GM406889139.pdfIn PDF document text
    • https://www.medlinerecruitment.com/uploaded_files/userfiles/files/coin-master-hacks-for-gold-cards_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_off00004e0d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E0D 25944 bytes
SHA-256: f1bd30689c1ee5af9a0e17f0bf1fa94e6d53bc58f0d414e10482f5e0c3283647
font_01_sfnt_off0000899e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x899E 19288 bytes
SHA-256: ea469787df873758e357019bb53a1e3c4242eb718badaf8706c42bdc2f61c813

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