Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0ca69f6e2c468ab…

MALICIOUS

PDF

49.9 KB Created: 2021-06-11 13:06:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f9ce2fc365e79dfdab4a2c6d69e1a44d SHA-1: 0ea0ccd44615148e0d38e55548d01a74fd1de7f6 SHA-256: e0ca69f6e2c468ab8af1c0db5659960fd3bc093ce6648ee5a22997cf73cc8174
200 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure to trick users into clicking a malicious link. The embedded URL, https://netcdn.tw/app/431946152/free-roblox-outfits-and-more-game-hack, is associated with known malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URLs suggest a potential for exploitation or redirection to a second-stage payload.

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/free-roblox-outfits-and-more-game-hack In PDF document text
    • http://digilibfisip.unla.ac.id/repository/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/2021-free-robux-game_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/100-robux_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-get-minecraft-for-free-on-iphone-2021_GM479516143.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/coin-master-hack-tool-ios_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/coin-master-apk-free-download_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-robux-no-email_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/minecraft-net-free_GM479516143.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/tiktok-free-jazz_GM835599320.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-robux-codes-june-2021_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/minecraft-for-free-apk_GM479516143.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/roblox-www-com_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/roblox-stalker-hack_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-robux-win-2021_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-get-loads-of-robux-for-free-2021_GM431946152.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_off000051e0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51E0 25992 bytes
SHA-256: 638b86e2347dc7d0709748c362e2ce4b3692140e4a0819e7aaa49e0259947240
font_01_sfnt_off00008f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F0B 6700 bytes
SHA-256: ae114634718854704d615808d33fb1b747d90eb28e420080bd5adbdfe7fb6a27
font_02_sfnt_off00009f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F48 18684 bytes
SHA-256: 913543b41d90acd5d6228c13812d71b5a33c67474edca0f8a71f3a401083b501

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