Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8fd5970de3c694d…

MALICIOUS

PDF

44.9 KB Created: 2021-06-09 03:40:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: eed49498b69e0d07e778ac128ba5cd11 SHA-1: 6c62ddb5585bae7702c9eba2936c5b3ee18b12bf SHA-256: f8fd5970de3c694d6891e8ae330a660a8172445c0f9bd6a30741dbb6dd821038
200 Risk Score

Malware Insights

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

The PDF contains a lure for game-related content, specifically a 'Roblox Hacker Mask', and presents a fake CAPTCHA to trick the user into clicking a link. This link, https://netcdn.tw/app/431946152/roblox-hacker-mask-game-hack, is identified as a malicious redirector. The overall goal appears to be directing the user to a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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-hacker-mask-game-hack In PDF document text
    • https://www.bathshoponline.co.uk/uploads/files/files/freespinandcoinblogspotcom-2021-11-coinmasterfreespinandcoinlinkshtml_GM406889139.pdfIn PDF document text
    • https://www.bathshoponline.co.uk/uploads/files/files/minecraft-free-download-2021_GM479516143.pdfIn PDF document text
    • https://www.bathshoponline.co.uk/uploads/files/files/roblox-redeem-codes-free_GM431946152.pdfIn PDF document text
    • https://www.bathshoponline.co.uk/uploads/files/files/minecraft-pe-apk_GM479516143.pdfIn PDF document text
    • https://www.bathshoponline.co.uk/uploads/files/files/coin-master-app_GM406889139.pdfIn PDF document text
    • https://www.bathshoponline.co.uk/uploads/files/files/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • https://www.bathshoponline.co.uk/uploads/files/files/how-much-robux-can-you-get-with-1-million-dollars_GM431946152.pdfIn PDF document text
    • https://www.bathshoponline.co.uk/uploads/files/files/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.bathshoponline.co.uk/uploads/files/files/hack-coin-master-game-download_GM406889139.pdfIn PDF document text
    • https://www.bathshoponline.co.uk/uploads/files/files/win-free-robux_GM431946152.pdfIn PDF document text
    • https://www.bathshoponline.co.uk/uploads/files/files/robux-free-online_GM431946152.pdfIn PDF document text
    • https://www.bathshoponline.co.uk/uploads/files/files/real-working-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.bathshoponline.co.uk/uploads/files/files/how-to-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.bathshoponline.co.uk/uploads/files/files/get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.bathshoponline.co.uk/uploads/files/files/free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.bathshoponline.co.uk/uploads/files/files/coin-master-332-apk-free-download_GM406889139.pdfIn PDF document text
    • https://www.bathshoponline.co.uk/uploads/files/files/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • https://www.bathshoponline.co.uk/uploads/files/files/coin-master-pet-food-free_GM406889139.pdfIn PDF document text
    • https://www.bathshoponline.co.uk/uploads/files/files/free-robux-real-working_GM431946152.pdfIn PDF document text
    • https://www.bathshoponline.co.uk/uploads/files/files/earn-free-spins-for-coin-master_GM406889139.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
font_00_sfnt_off0000523a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x523A 25276 bytes
SHA-256: 4a0070c4edece994bed1b607453e897d9a719ebcc456db315e3212d36e6b296d
font_01_sfnt_off00008ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CCC 18376 bytes
SHA-256: c764e87158d26659d007f8d265665161089a95e66ef8c63eb337958ae6d15209

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