Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e72ed389db5025…

MALICIOUS

PDF

43.3 KB Created: 2021-06-13 19:51:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3e61b2a67d8db3c71916bc42c53235db SHA-1: 4af9035b3feb32870def53a2ee994e1b411e57b9 SHA-256: 57e72ed389db50255aee7608135aec8bd5089847c75c03f7967bc4a41a1374ba
200 Risk Score

Malware Insights

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

The PDF document contains embedded links that redirect to a 'game hack' generator, which is a common lure for malicious sites. The document also displays a fake CAPTCHA, designed to trick users into interacting with the content, likely to trigger a download or exploit. The presence of multiple redirector links and the ML classification strongly indicate malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://netcdn.co/app/431946152/hack-fly-roblox-jailbreak-2021-game-hack In PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/free-minecraft-texture-packs-java_GM479516143.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/counter-blox-roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/hack-roblox-apk-mobil_GM431946152.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/pubg-uc-carding-telegram_GM1330123889.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/minecraft-free-ios_GM479516143.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/roblox-cheat-program_GM431946152.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/coin-master-daily-free-spins-today_GM406889139.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/minecraft-bedrock-free-server-hosting_GM479516143.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/sb-game-hacker-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/coin-master-free-in-app-purchases-jailbreak_GM406889139.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/minecraft-modded-client_GM479516143.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/cheats-and-codes-for-roblox-on-pc_GM431946152.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/assassin-2-hack-roblox-script_GM431946152.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/roblox-free-username-change_GM431946152.pdfIn PDF document text
    • http://pustaka.faterna.unand.ac.id/repository/free-minecraft-coins_GM479516143.pdfIn PDF document text
    • https://www.bandicam.comIn 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_003_off000048e9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48E9 26136 bytes
SHA-256: 26af5a05b4667b8d6e634a144afdaabe2f9bc2c80ea44d624b2aef3cf9511a88
font_01_sfnt_off00008404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8404 19212 bytes
SHA-256: b4bdaebd9e393c8a1002f450f9556fc4e32e38da511cd583b1577493d5291994

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