Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8d7bf4c76c9f0c…

MALICIOUS

PDF

251.0 KB Created: 2021-07-05 20:58:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 02d6deedf170584a5426fcf60ca6f243 SHA-1: cd675e3e86857d6b7cf0b5db2cc5a88f12d73827 SHA-256: 5f8d7bf4c76c9f0cfe2b835ad304df148390c0975d96a72a0f68e2bc0b2169be
218 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple heuristics indicating a lure for game-related cheats or generators, specifically pointing to a malicious redirector URL. The presence of a fake CAPTCHA and MFA lure suggests an attempt to trick users into performing actions that could lead to credential theft or further compromise. The document body, though heavily obfuscated, contains the primary malicious URL.

Machine Learning

  • Nyx PDF Classifier clean score 0.0098

Heuristics 7

  • 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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/1330123889/pubg-uc-midasbuy-pakistan-game-hack In PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/bandit-free-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-free-robux-without-downloading-apps-for-ios_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/gideon-the-streets-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-hack-retail-tycoon_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/is-it-illegal-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/inappropriate-roblox-games-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/minecraft-apk-free-download-016-0_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/hacks-for-roblox-o-survey_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-hack-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/hacking-roblox-trhough-coockies_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/developer-console-script-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/umpteen-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-disney-plus-accounts-tiktok_GM835599320.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-check-it-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-do-i-get-free-stuff-on-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_024_off00037d3c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37D3C 26028 bytes
SHA-256: 2ad49b424b44622a58675864c109eef49985a72c04777ed85450fdc3a713541a
font_01_sfnt_off0003ba85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BA85 19068 bytes
SHA-256: 2e68674ed1d6c8f556a87c4f689bd7fd96e08c10e5d30d96afbd6fdf29e87592

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