Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8fd88b77a5cc534…

MALICIOUS

PDF

34.1 KB Created: 2021-07-06 06:25:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 25a76a84147463f75129329cd1c2b5f0 SHA-1: 9347aa729b26ed7e590542b721e0b68f1f23d5fb SHA-256: f8fd88b77a5cc53411aef4347a92e84fa7c6e63f4d146df97b2cc08f6f45153a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links that are flagged as malicious redirectors, specifically targeting users with lures for game hacks and free currency. The document body and embedded URLs strongly suggest a phishing or malware distribution attempt, likely using a spearphishing attachment as the initial access vector. No scripts were extracted, but the presence of malicious links indicates a high likelihood of leading users to harmful content or downloads.

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 http://netcdn.tw/app/406889139/coin-master-hack-apk-android-game-hack In PDF document text
    • http://acquacleanpiscinas.com.br/images/ckfinder/files/roblox-hack-script-list_GM431946152.pdfIn PDF document text
    • http://acquacleanpiscinas.com.br/images/ckfinder/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://acquacleanpiscinas.com.br/images/ckfinder/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://acquacleanpiscinas.com.br/images/ckfinder/files/free-code-roblox-animation_GM431946152.pdfIn PDF document text
    • http://acquacleanpiscinas.com.br/images/ckfinder/files/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
    • http://acquacleanpiscinas.com.br/images/ckfinder/files/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • http://acquacleanpiscinas.com.br/images/ckfinder/files/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://acquacleanpiscinas.com.br/images/ckfinder/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://acquacleanpiscinas.com.br/images/ckfinder/files/how-to-hack-robux-with-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • http://acquacleanpiscinas.com.br/images/ckfinder/files/nuevo-hack-165-ept-generador-de-robux-by-piignoiise_GM431946152.pdfIn PDF document text
    • http://acquacleanpiscinas.com.br/images/ckfinder/files/free-roblox-accounts-with-robux-not-banned_GM431946152.pdfIn PDF document text
    • http://acquacleanpiscinas.com.br/images/ckfinder/files/coin-master-daily-free-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • http://acquacleanpiscinas.com.br/images/ckfinder/files/mad-city-roblox-hack_GM431946152.pdfIn PDF document text
    • http://acquacleanpiscinas.com.br/images/ckfinder/files/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://acquacleanpiscinas.com.br/images/ckfinder/files/roblox-guess-the-emoji-cheats_GM431946152.pdfIn PDF document text
    • http://acquacleanpiscinas.com.br/images/ckfinder/files/roblox-sword-fighting-tournament-money-hack_GM431946152.pdfIn PDF document text
    • http://acquacleanpiscinas.com.br/images/ckfinder/files/roblox-giving-away-free-robux_GM431946152.pdfIn PDF document text
    • http://acquacleanpiscinas.com.br/images/ckfinder/files/coin-master-free-spins-8-14-2021_GM406889139.pdfIn PDF document text
    • http://acquacleanpiscinas.com.br/images/ckfinder/files/how-to-get-free-robux-dec-219_GM431946152.pdfIn PDF document text
    • http://acquacleanpiscinas.com.br/images/ckfinder/files/get-free-robux-without-human-verification_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_002_off000030bb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30BB 22272 bytes
SHA-256: 13eafe831d8e43516139863500df5d60ccc49151331001937dde174e88c22f9e
font_01_sfnt_off0000622b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x622B 18352 bytes
SHA-256: 409485f038817ffbd71fe8cb604f03d96401c5d2dee0684d6cdd4c51b1463fa9