Malicious PDF — malware analysis report

Static analysis result for SHA-256 72a5993ae8c01d8b…

MALICIOUS

PDF

48.5 KB Created: 2021-06-08 14:56:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a99ec433277db533ec19f6baa80ad6d4 SHA-1: 8ddf6764589879706da1257e0d4633c549c3a4d0 SHA-256: 72a5993ae8c01d8b343e8af90048e05c12a983b3c3edd760897797b1370aaa80
200 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to entice users into clicking a link, which redirects to a malicious site. The primary link, 'https://netcdn.tw/app/431946152/roblox-hack-download-2021-android-game-hack', is associated with known malicious redirector infrastructure. The document's content and heuristics strongly suggest an attempt to deliver a second-stage payload or lead the user to a phishing or scam page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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-hack-download-2021-android-game-hack In PDF document text
    • http://www.jsvillas.com.tw/assets/files/2021-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/todays-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-hack-apk-app_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/minecraft-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-hack-2021-apk_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-levels_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/how-to-get-free-faces-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/no-robux_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-coin-master-spins-link-download_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/minecraft-pe-free-download-ios_GM479516143.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/500-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/freer-pro-tiktok_GM835599320.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-roblox-account-generator_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-game-hack-link_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005183.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5183 25896 bytes
SHA-256: 7cad9e743c92686bc4226b587a363a5767298cebb80bb2c1207a09cf85ba2007
font_01_sfnt_off00008afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AFC 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off000097a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97A4 19208 bytes
SHA-256: f476479de627017b9d1ffdb60fd55aae211521e630f93a3b1d5f708751e2c8bf

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