Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff621d4021a5872…

MALICIOUS

PDF

46.8 KB Created: 2021-06-11 10:08:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 09e62a9609fb18c15fb0620e068b5c44 SHA-1: dc909a99f3086b3a156f8690845144ace91d19e6 SHA-256: 7ff621d4021a5872f1690c08d31e5cdb1a03f7779fa216c680620e3f63f65476
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors and game hack lures, indicating a phishing or malware distribution attempt. The document body and embedded links promote 'free generators' and 'hacks' for popular games, aiming to trick users into visiting malicious sites. The presence of multiple redirector links and a high ML classifier score strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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-hack-on-roblox-jailbreak-into-police-game-hack In PDF document text
    • http://heilzentrum-ulm.de/images/app-store-games-free-download-roblox_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-get-robux-free-no-download-quick-2021_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-money-cheat-codes_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/tiktok-free-followers-hack_GM835599320.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-javascript-2021_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/phoenix-signs-hack-roblox-account_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-buy-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/daily-free-spins_GM406889139.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-username_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/robux-free-tips-apk_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-change-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-robux-hack-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-minecraft-svg-cutting-files_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/como-hackear-los-robux-de-roblox_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-modded-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/descargar-hack-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-online-play-roblox_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_off000054d6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54D6 26564 bytes
SHA-256: d6bbb27d4437a591bc384d975df4e31329345980b2724a647a23f43ff98cdf96
font_01_sfnt_off00009289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9289 18888 bytes
SHA-256: b8ac9363a35bb08edf7211eca6aab49ef8d3ff8e3c2d355f3fc7298acb65d498

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