Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5fe760836c4e1b…

MALICIOUS

PDF

33.6 KB Created: 2021-07-03 14:13:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: cd484fc0c43f6a8e75d8a3a424c384ed SHA-1: b1c81815dfc15630244a1fdee6def046b1f415e4 SHA-256: 3f5fe760836c4e1bbd28d54a1a3744b3caba7beacb9e84e5aa1e6747bbbc7b0e
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, masquerading as 'free generators' or 'game hacks' for popular games. The primary lure appears to be related to Minecraft and Roblox, aiming to trick users into visiting potentially malicious sites. The ML classifier strongly indicated maliciousness, and the PDF structure itself points to external resource redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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 http://netcdn.tw/app/479516143/is-minecraft-education-edition-free-game-hack PDF link annotation
    • http://www.valenciamaids.com/userfiles/files/robux_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/cm-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/how-to-find-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/how-to-get-free-robux-legit-2021_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/roblox-50-robux-free_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/how-to-get-boombox-for-free-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/minecraft-world-free-download_GM479516143.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/collect-robux_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-robux-codes-not-clickbait_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-robux-discord_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/daily-free-coin-and-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/roblox-apk-hack_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/can-you-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/tiktok-free-view-iphone-theme_GM835599320.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/wurst-minecraft_GM479516143.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/get-free-cards-in-coin-master_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
font_00_sfnt_off0000305b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x305B 21984 bytes
SHA-256: 12228e1201c2a9ef6af069f5cdb13ab4c68d92c981aea9eb1ef31f22f01ca060
font_01_sfnt_off000060b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60B4 18312 bytes
SHA-256: eecac33872f4bf99db25d0145d9acf2ab6d7270ffb9fefd56cdfeedcf9aa8f6d

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