Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa8a31e395387fbe…

MALICIOUS

PDF

45.1 KB Created: 2021-06-11 06:30:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c62ed48377a9531aa5c7bb22bec0b3fc SHA-1: 3d5f2f1258d1c8eed928571130934bfbca2378ec SHA-256: fa8a31e395387fbeb2cd1df8ce51eaa3f18ef848aba5ac7636efd54a28557ff1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to websites promoting 'game hacks' and 'free robux', indicating a lure for users interested in such content. The primary redirector URL is associated with known malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or scam campaign aimed at tricking users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/how-to-use-roblox-hack-script-game-hack In PDF document text
    • http://pesok-rk.ru/images/minecraft-pe-free_GM479516143.pdfIn PDF document text
    • http://pesok-rk.ru/images/wahoogaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://pesok-rk.ru/images/coin-master-35-2-hack_GM406889139.pdfIn PDF document text
    • http://pesok-rk.ru/images/cheat-engine-roblox-code_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/free-de-la-hoya-pants-roblox_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/win-free-robux_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdfIn PDF document text
    • http://pesok-rk.ru/images/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/100-robux_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/get-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • http://pesok-rk.ru/images/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://pesok-rk.ru/images/how-to-get-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • http://pesok-rk.ru/images/coin-master-cards-hack-2021_GM406889139.pdfIn PDF document text
    • http://pesok-rk.ru/images/como-hackear-robux-en-roblox-facil-y-rapido-en-celular_GM431946152.pdfIn PDF document text
    • http://pesok-rk.ru/images/minecraft-free-online-games_GM479516143.pdfIn PDF document text
    • http://pesok-rk.ru/images/roblox-anti-hack-saving_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_004_off000051cb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51CB 25232 bytes
SHA-256: c9063b00c40b5f19c8647cd52c48a5183a597dc0f0e4814c1495ea43001ff02a
font_01_sfnt_off00008bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BC5 18932 bytes
SHA-256: 3c9318a545e76695ac124b7668397177bfcf4510e96c97df1cb6a5b52715859c

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