Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d11a61fd031b481…

MALICIOUS

PDF

33.6 KB Created: 2021-07-20 05:10:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c42cda439d9a98af3397f5cc6607fe0d SHA-1: 6097c406980f88c4712ce2e2a22aa3dd5d3d1659 SHA-256: 6d11a61fd031b481a65731ebd1be5d82e2a1e250a1749530a9215f95a7d7f002
160 Risk Score

Malware Insights

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

The PDF contains multiple links to a known malicious redirector, http://netcdn.tw/app/431946152/roblox-free-robux-generator-game-hack, which is disguised as a 'free generator / game hack' for Roblox. This lure is designed to trick users into clicking the link, likely leading them to a site that hosts further malicious content or attempts to exploit vulnerabilities. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 4

  • 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.
  • 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.tw/app/431946152/roblox-free-robux-generator-game-hack In PDF document text
    • https://purihostel.com/assets/CKImages/files/create-minecraft-server-free_GM479516143.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/free-robux-accounts_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/minecraft-multiplayer-free_GM479516143.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/free-robux-no-verification-needed_GM431946152.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_off00002d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D1C 22792 bytes
SHA-256: ba5510f1ba7ee78752c9e76ea986eb09ff983f284ba68f56e875f6648421a59c
font_01_sfnt_off00006056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6056 18604 bytes
SHA-256: f4da5a4be87a865c2adc8534a5df385e39f9c5c84370db66cd94c5780a417de6

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