Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aba4a3e8d2c63d9…

MALICIOUS

PDF

43.6 KB Created: 2021-05-10 14:31:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 1b776df474b8fad9394ac778a79eed5b SHA-1: 301d1d6c39c9a33d415b9173de1e6a760da688d5 SHA-256: 7aba4a3e8d2c63d9fb7c451c738f3c8ed6dc378c31642e8d63c66d69067262e1
162 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, including one pointing to 'netcdn.xyz', which is flagged as a lure for game hacks and impersonates Facebook. This suggests a credential phishing or malware distribution attempt. The document body is heavily obfuscated, but the presence of links and the 'game hack' lure strongly indicate a malicious intent to trick users into clicking through to a potentially harmful site. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.xyz/app/406889139/coin-master-strategy-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
  • 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.xyz/app/406889139/coin-master-strategy-game-hack PDF link annotation
    • http://www.library.gkigadingserpong.org/repository/how-to-get-free-pet-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/robux-premium_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-hack-mod-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-hack-apk-ios-download_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/games-that-can-be-hacked_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-game-hack_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/legit-coin-master-hack-october-2021_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-no-password_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/robux-gratis_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-mast-hacks_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-free-spins-no-verification_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-spins-coin-master-march-2021_GM406889139.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_003_off00004ba9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BA9 27060 bytes
SHA-256: 1e5dbe404e9e2f17e4be54ba955510034dfb9a78a7e2e2332cb125d5fae70cc6
font_01_sfnt_off000088c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88C7 18012 bytes
SHA-256: 2725a275d7a7b6911fa27290e512be704a3c63b9da69f1e3192c77e1806eef94

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