Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a81136904f1bc54…

MALICIOUS

PDF

45.0 KB Created: 2021-05-15 14:18:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f1817c620631470399e0e400b6efdead SHA-1: db23a5365ae09b3a701b255b3df15eb70277f953 SHA-256: 4a81136904f1bc54cbfaa9a2986b5750e940f6c9f030baadd533c826ce5e1b1f
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains a fake CAPTCHA lure and a malicious link designed to trick users into visiting a website offering game hacks. The link redirects to 'https://netcdn.xyz/app/406889139/hack-coin-master-free-game-hack', which is flagged as a known malicious redirector. The document's structure and content strongly suggest a phishing or social engineering attack aimed at driving traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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
  • 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/406889139/hack-coin-master-free-game-hack In PDF document text
    • http://www.cosver.nl/images/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.cosver.nl/images/free-roebucks_GM431946152.pdfIn PDF document text
    • http://www.cosver.nl/images/coin-master-free-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.cosver.nl/images/free-fire-coin-master_GM406889139.pdfIn PDF document text
    • http://www.cosver.nl/images/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.cosver.nl/images/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://www.cosver.nl/images/free-spin-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://www.cosver.nl/images/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • http://www.cosver.nl/images/hack-coin-master-apk-33_GM406889139.pdfIn PDF document text
    • http://www.cosver.nl/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.cosver.nl/images/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://www.cosver.nl/images/minecraft-pocket-edition-mods-for-free_GM479516143.pdfIn PDF document text
    • http://www.cosver.nl/images/unlimited-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.cosver.nl/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.cosver.nl/images/javascript-free-robux_GM431946152.pdfIn PDF document text
    • http://www.cosver.nl/images/robux-app_GM431946152.pdfIn PDF document text
    • http://www.cosver.nl/images/best-free-roblox-executor_GM431946152.pdfIn PDF document text
    • http://www.cosver.nl/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.cosver.nl/images/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.cosver.nl/images/minecraft-iphone-free_GM479516143.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_off0000476b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x476B 32080 bytes
SHA-256: 23f3bf8376ceb3aa3649bfc75eef153362a113b55f3fadab19e69c57a8bfd55a
font_01_sfnt_off00008f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F33 17880 bytes
SHA-256: 257aee740a5ae17e91b93ad4d540c168849f24efe28ef42b55966c96749a0114

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