Malicious PDF — malware analysis report

Static analysis result for SHA-256 9524eed635a3e987…

MALICIOUS

PDF

43.1 KB Created: 2021-06-10 18:31:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d00bda5d9fa419fcd3114d6dd6e00ac1 SHA-1: ac3b89ea378e40c8713a09b0b444a623538d392c SHA-256: 9524eed635a3e9875e181cdd00d05ad199d2aa8d4dda5617274716edbe7dfbc5
220 Risk Score

Malware Insights

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

The PDF document contains a lure for a 'free generator / game hack' which redirects to a known malicious URL. The presence of a fake CAPTCHA heuristic suggests an attempt to trick the user into interacting with the malicious link. While no scripts were explicitly extracted, the nature of the lure and the malicious redirector indicate a likely attempt to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

Heuristics 6

  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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-offsale-items-roblox-game-hack In PDF document text
    • https://opac.itp.ac.id/repository/optifine-pe_GM479516143.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/youtube-roblox-how-get-free-animation_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/roblox-hack_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/minecraft-pe-015-0-apk-free-download_GM479516143.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/roblox-free-packages-download_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/free-pro-tiktok_GM835599320.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/roblox-rewards_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/how-to-hack-roblox-accounts-on-a-phone_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/roblox-cheat-engine-64-money-hack_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/minecraft-rtx-download-free_GM479516143.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/roblox-free-hair-codes_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/coin-master-free-spins-link-october-2021_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/coin-master-hack-mod-apk-2021-download_GM406889139.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.itp.ac.id/repository/synapse-roblox-hack-dll_GM431946152.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
stream_004_off00004cf4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CF4 24460 bytes
SHA-256: 338497780c92daa1184544fc5c25cd4e01d8e41a820407b035b407028bba2fb5
font_01_sfnt_off000084ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84EE 18540 bytes
SHA-256: 25753dfe06eb2c87a3abde2e2dce8c13c10aed82d1d40cc1f60bb563f25dddb5

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