Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd1bd97a25e3b258…

MALICIOUS

PDF

44.0 KB Created: 2021-06-03 08:00:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 377e0b49e37fac47fbf8c63b29b34792 SHA-1: 3812fcf315e80806cad48978f8ea1855d258ce32 SHA-256: dd1bd97a25e3b258774155ac6a186a96f2aa78689ab492cac26f1378f5febf7b
200 Risk Score

Malware Insights

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

The PDF contains a malicious link disguised as a game hack generator, which is a common lure for phishing or malware distribution. The presence of a fake CAPTCHA heuristic further supports the intent to trick the user into interacting with the malicious content. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URL is the primary IOC.

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.online/app/479516143/minecraft-hacks-ps4-game-hack In PDF document text
    • https://www.mentalhealthnow.co.uk/uploads/files/files/free-shirt-templates-roblox_GM431946152.pdfIn PDF document text
    • https://www.mentalhealthnow.co.uk/uploads/files/files/coin-master-hacking-news_GM406889139.pdfIn PDF document text
    • https://www.mentalhealthnow.co.uk/uploads/files/files/how-to-get-free-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.mentalhealthnow.co.uk/uploads/files/files/coin-master-daily-gift-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.mentalhealthnow.co.uk/uploads/files/files/coin-master-ad_GM406889139.pdfIn PDF document text
    • https://www.mentalhealthnow.co.uk/uploads/files/files/tiktok-followers-for-free_GM835599320.pdfIn PDF document text
    • https://www.mentalhealthnow.co.uk/uploads/files/files/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • https://www.mentalhealthnow.co.uk/uploads/files/files/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://www.mentalhealthnow.co.uk/uploads/files/files/roblox-hack-how-to-get-someones-password_GM431946152.pdfIn PDF document text
    • https://www.mentalhealthnow.co.uk/uploads/files/files/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://www.mentalhealthnow.co.uk/uploads/files/files/free-robux-net_GM431946152.pdfIn PDF document text
    • https://www.mentalhealthnow.co.uk/uploads/files/files/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • https://www.mentalhealthnow.co.uk/uploads/files/files/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • https://www.mentalhealthnow.co.uk/uploads/files/files/download-hack-coin-master-apk_GM406889139.pdfIn PDF document text
    • https://www.mentalhealthnow.co.uk/uploads/files/files/pokemon-go-free-yellow-team_GM1094591345.pdfIn PDF document text
    • https://www.mentalhealthnow.co.uk/uploads/files/files/free-robux-today_GM431946152.pdfIn PDF document text
    • https://www.mentalhealthnow.co.uk/uploads/files/files/how-to-get-minecraft-for-free-on-android-device_GM479516143.pdfIn PDF document text
    • https://www.mentalhealthnow.co.uk/uploads/files/files/roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://www.mentalhealthnow.co.uk/uploads/files/files/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.mentalhealthnow.co.uk/uploads/files/files/coin-master-free-coins-2021_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_off000051f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51F9 25020 bytes
SHA-256: 38baeb9ce42a6d3cce0dd46ff2cf30bd37f23b8aa27e5ecd0f60a5132b15f027
font_01_sfnt_off00008a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A79 17956 bytes
SHA-256: 1505b4888ad519265159139ab27414f60b3662b7296b0e348d1315d60862a2b5

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