Malicious PDF — malware analysis report

Static analysis result for SHA-256 570e5315f1f5f461…

MALICIOUS

PDF

45.7 KB Created: 2021-06-03 05:21:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c810c2be6a0949a53e81cb6959ce8d07 SHA-1: 4976098b2c081359886616e37045c23888034f76 SHA-256: 570e5315f1f5f46106d12f8af719ffd12afff1b177155e4cd8b760fff9c39913
240 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA and a "free generator / game hack" lure, impersonating Amazon, to deceive users into clicking a malicious link. The primary malicious URL identified is https://netcdn.online/app/431946152/free-robux-master-game-hack, which is part of a redirector chain. The document's content and heuristics strongly suggest a credential phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.online/app/431946152/free-robux-master-game-hack.
  • 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/431946152/free-robux-master-game-hack In PDF document text
    • http://perpus.masda.ac.id//repository/legitimate-coin-master-free-spins-apk_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-online-hack_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-hack-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/roblox-online-free_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/pokemon-go-free-game-online_GM1094591345.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/all-free-items-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-robux-just-click_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-roblox-glasses_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/avatar-de-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-hack-no-download_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-get-java-minecraft-free_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/is-minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/minecraft-free-online-games_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-earn_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/minecraft-free-download_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.communes.comIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005239.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5239 26416 bytes
SHA-256: 328c2ae8cbad0f2b7ddac9165996f3e3ab3f8c751b58e8d2493818f4b3c76190
font_01_sfnt_off00008f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F56 18544 bytes
SHA-256: 5f92163030842751a82ce86b738a68b4d97fee0a57e838fb4c20f827a47ffbab

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