Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef91a530d64a8639…

MALICIOUS

PDF

45.9 KB Created: 2021-06-11 05:44:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3fdef64eebf3cb8dd13d12ce70e34c45 SHA-1: e8c0cbd07b457e837d6c629ae8e4bc7149804dd4 SHA-256: ef91a530d64a86399ea976da1246894bf792a9b5794a814f09820c49382c1616
200 Risk Score

Malware Insights

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

This PDF document employs a lure related to game hacks and generators, presenting a fake CAPTCHA to trick users into interacting with malicious links. The embedded URLs, such as https://netcdn.tw/app/431946152/roblox-game-hack-download-game-hack, are identified as malicious redirectors, likely serving as a gateway to further malicious content or downloads. The ML classifier also flagged this PDF as malicious, supporting the observed malicious behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/roblox-game-hack-download-game-hack In PDF document text
    • https://sensorcamera-tw.com/upload/files/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/free-roblox-boy-hair_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/roblox-game-free-download_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/coin-master-hack-apk-download-for-android_GM406889139.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/free-place-roblox_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/claim-free-robux-button_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/free-tiktok-likes-2021_GM835599320.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/ultimate-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/coin-master-spin-link-free-download_GM406889139.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/easy-way-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/free-chest-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052a4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52A4 25732 bytes
SHA-256: cad22fe445389b4a34741e0b4785c752a8aedf33a39baa49de5755f17564da86
font_01_sfnt_off00008ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EC6 18948 bytes
SHA-256: 27eb23edecd4e57681fb54aa6289edf23754c308d566dd94967126363e1d2292

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