Malicious PDF — malware analysis report

Static analysis result for SHA-256 af768bbdf80459d8…

MALICIOUS

PDF

45.7 KB Created: 2021-06-07 18:24:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 85b28a510be5b084a838c4e1f6c35f99 SHA-1: 55bb26ddd3eecb40ef8d55e97ab801585ff9adb3 SHA-256: af768bbdf80459d82f74afa8ceb08ab9b5a1dea17eed5bfb38ff4c7693c87dd5
122 Risk Score

Malware Insights

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

This PDF document employs a lure of game hacks and free in-game currency, impersonating brands like Facebook to entice users. It contains multiple links to external websites, including one that appears to be a redirector for game hacking tools. The ML classifier also flagged this PDF as malicious, indicating a high probability of malicious intent. No scripts were extracted, but the document's structure and embedded links suggest it is designed to lead the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.
  • 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.tw/app/431946152/how-to-hack-roblox-games-without-cheat-engine-2021-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.tw/app/431946152/how-to-hack-roblox-games-without-cheat-engine-2021-game-hack PDF link annotation
    • https://www.sg-escholzmatt.ch/images/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • https://www.sg-escholzmatt.ch/images/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://www.sg-escholzmatt.ch/images/free-minecraft-account-and-password_GM479516143.pdfIn PDF document text
    • https://www.sg-escholzmatt.ch/images/appsmob-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.sg-escholzmatt.ch/images/minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • https://www.sg-escholzmatt.ch/images/free-robux-quiz_GM431946152.pdfIn PDF document text
    • https://www.sg-escholzmatt.ch/images/coin-master-free-spins-link-facebook-page_GM406889139.pdfIn PDF document text
    • https://www.sg-escholzmatt.ch/images/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.sg-escholzmatt.ch/images/minecraft-free-apk-download-016-0_GM479516143.pdfIn PDF document text
    • https://www.sg-escholzmatt.ch/images/hack-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • https://www.sg-escholzmatt.ch/images/coin-master-hack-software-download_GM406889139.pdfIn PDF document text
    • https://www.sg-escholzmatt.ch/images/how-to-get-minecraft-dungeons-for-free_GM479516143.pdfIn PDF document text
    • https://www.sg-escholzmatt.ch/images/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.sg-escholzmatt.ch/images/how-to-hack-a-minecraft-account_GM479516143.pdfIn PDF document text
    • https://www.sg-escholzmatt.ch/images/free-robux-website_GM431946152.pdfIn PDF document text
    • https://www.sg-escholzmatt.ch/images/minecraft-hacks-xbox_GM479516143.pdfIn PDF document text
    • https://www.sg-escholzmatt.ch/images/easy-ways-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.sg-escholzmatt.ch/images/free-gold-cards-coin-master_GM406889139.pdfIn PDF document text
    • https://www.sg-escholzmatt.ch/images/roblox-hack-client_GM431946152.pdfIn PDF document text
    • https://www.sg-escholzmatt.ch/images/minecraft-112-hacked-client_GM479516143.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_off00004fee.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FEE 25664 bytes
SHA-256: 3ba40abd43e237b8b75599f76e979ce93207dcca89760fc02aab6faa60feb257
font_01_sfnt_off00008ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC1 20024 bytes
SHA-256: 25875a4deaeca8818a302ec570db639e749fb777a37cc92d7afc42a135054504

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