Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd3924fd4ef4032…

MALICIOUS

PDF

46.2 KB Created: 2021-06-11 12:17:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 2412deb0b93027b0c1a654f825c30b52 SHA-1: 3c71d3750331bdf33f130d2ab7680d3687772c2a SHA-256: 7fd3924fd4ef40325fb34b827f3bbb03250af9c930bc0ec589df11040dd75b9a
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links to external websites, many of which are disguised as game-related resources or hacks. It also presents a fake CAPTCHA or human verification prompt, a common social engineering tactic to trick users into clicking malicious links. The primary URL, https://netcdn.tw/app/431946152/hacks-for-boku-no-roblox-remastered-game-hack, is directly associated with this lure. The document's structure and content strongly suggest it is part of a phishing or scam campaign designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/hacks-for-boku-no-roblox-remastered-game-hack PDF link annotation
    • http://www.stttekstil.ac.id/elib/repository/coin-master-free-spin-whatsapp-group_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/pokemon-go-free-yveltal_GM1094591345.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-hacks-for-imac_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-adopt-me-free-pets_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-builders-club-free_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/pokemon-go-free-and-nintendo-switch_GM1094591345.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-mod-apk-latest-version-free-download_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/minecraft-nintendo-switch-digital-code-free_GM479516143.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-robux-exe_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-roblox-account-generator_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/300-daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-do-i-hack-roblox-game_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-apk-hack-3527_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-robux-generater-no-human-verificaition_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-get-minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/apps-that-give-you-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_off000051b5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51B5 27188 bytes
SHA-256: 4f806e891b395d6ff57394823426757ffe6186e58b54f9686f855e0b44353bed
font_01_sfnt_off00008fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FDF 19024 bytes
SHA-256: dc8e6a8a72f3ec0ce01d0284b3a78d6467312770802dd053313113e9c5c29b29

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