Malicious PDF — malware analysis report

Static analysis result for SHA-256 74e1b645ddbbf2b0…

MALICIOUS

PDF

45.4 KB Created: 2021-06-09 05:06:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3003bf351a602e91c767feb95ca5ad4e SHA-1: 878ede3a36c4c260933d43610eed63f54a84d2ab SHA-256: 74e1b645ddbbf2b0a7121cf8f30b430121f05006d899fa594956b89aa45e0c31
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors and lures users with a fake CAPTCHA, aiming to trick them into clicking these links. The primary link, 'https://netcdn.tw/app/431946152/dantdm-free-robux-game-hack', is associated with a 'free generator / game hack' lure. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/dantdm-free-robux-game-hack In PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/minecraft-hack-client-18-9_GM479516143.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/free-tiktok-followers-no-human-verification_GM835599320.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/microsoft-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/robux-rewards_GM431946152.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/how-to-set-skybox-roblox-hack_GM431946152.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/youtube-roblox-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/how-to-get-free-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/minecraft-education-edition-free-download_GM479516143.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/minecraft-java-edition-free-download-for-android_GM479516143.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/minecraft-pc-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/how-to-get-free-stuff-on-roblox-mobile-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/citizen-free-robux_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_off00005189.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5189 25540 bytes
SHA-256: f73e1ac27017f9c44e0fd0975fda0afd47c8b9b990a4a356498f99ca9c1b890a
font_01_sfnt_off00008cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CD0 18948 bytes
SHA-256: 185e1c1e520d0567795b59b44cf2c333a8051a11ab578b7e616cd9b18f9093aa

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