Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9bf5554ded87646…

MALICIOUS

PDF

48.3 KB Created: 2021-06-03 10:42:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: e95c42eb65f39d80ae5b0baec30c036a SHA-1: ea8dd3c5b89008a4bd37fd0f5bf78e592eff9651 SHA-256: a9bf5554ded87646cba678d472c6dd4971cb1684457808746f96207e4f1d6d75
122 Risk Score

Malware Insights

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

The PDF file contains a high-severity heuristic indicating it links to a 'free generator / game hack' redirector, and also displays a fake CAPTCHA or human verification prompt. This suggests a social engineering attack to trick the user into clicking the malicious link. The embedded URL leads to a site promising free Robux, a common lure for such attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • 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.online/app/431946152/free-robux-cards-game-hack PDF link annotation
    • http://library.imz.or.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/coin-master-free-spin-and-trading-group_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/coin-master-generator-free_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/how-do-you-get-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/minecraft-bedrock-edition-download-pc-free_GM479516143.pdfIn PDF document text
    • http://library.imz.or.id/repository/free-minecraft-texture-packs-java_GM479516143.pdfIn PDF document text
    • http://library.imz.or.id/repository/free-roblox-account-generator_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/roblox-robux-hack-no-survey-working_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://library.imz.or.id/repository/can-you-still-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://library.imz.or.id/repository/minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://library.imz.or.id/repository/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • http://library.imz.or.id/repository/kuso-icu-roblox-hack_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5127 23900 bytes
SHA-256: 343d144ce3a44c1afe50cad3e839cf83a5f36d21f4f845f2c9dfe7ec0d5de69f
font_01_sfnt_off0000879c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x879C 7448 bytes
SHA-256: a76ff9b4805dcff342f7268a16e2e3c2ff2b31b96c381fe4deb6ceea777bce90
font_02_sfnt_off0000997f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x997F 18416 bytes
SHA-256: 79c56a0f23d4fc34690a575a065be14b64911c3c5a3331038291264b4b7107af

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