Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b43b9bf709c73e…

MALICIOUS

PDF

34.6 KB Created: 2021-06-30 18:47:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: dfcf3cc517e346036e4afa9698cab498 SHA-1: 2cd677a32da81721db7c47ba94e9f9f7570c7b0b SHA-256: 18b43b9bf709c73e5251830d923ee03327d798164b8ad822c2cfd69c6fe4ec76
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a redirector URL, http://netcdn.co/app/431946152/roblox-hack-generator-robux-game-hack, which is flagged as malicious. The document body and embedded links suggest a lure for free game currency (Robux) for the game Roblox, likely leading users to a malicious site. No scripts were extracted, but the PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.co/app/431946152/roblox-hack-generator-robux-game-hack In PDF document text
    • https://www.aeroplanemarket.com/uploaded_files/userfiles/files/blox-pink-robux-free_GM431946152.pdfIn PDF document text
    • https://www.aeroplanemarket.com/uploaded_files/userfiles/files/how-to-take-free-robux_GM431946152.pdfIn PDF document text
    • https://www.aeroplanemarket.com/uploaded_files/userfiles/files/hacked-appbounty-roblox_GM431946152.pdfIn PDF document text
    • https://www.aeroplanemarket.com/uploaded_files/userfiles/files/free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.aeroplanemarket.com/uploaded_files/userfiles/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.aeroplanemarket.com/uploaded_files/userfiles/files/free-spins-for-coin-master-on-1-19-19_GM406889139.pdfIn PDF document text
    • https://www.aeroplanemarket.com/uploaded_files/userfiles/files/coin-master-redeem-code-free_GM406889139.pdfIn PDF document text
    • https://www.aeroplanemarket.com/uploaded_files/userfiles/files/info-de-jon-fue-el-hacker-de-roblox_GM431946152.pdfIn PDF document text
    • https://www.aeroplanemarket.com/uploaded_files/userfiles/files/cheat-engine-for-mac-roblox_GM431946152.pdfIn PDF document text
    • https://www.aeroplanemarket.com/uploaded_files/userfiles/files/how-to-hack-roblox-games-no-downloads-2021_GM431946152.pdfIn PDF document text
    • https://www.aeroplanemarket.com/uploaded_files/userfiles/files/free-robux-accounts_GM431946152.pdfIn PDF document text
    • https://www.aeroplanemarket.com/uploaded_files/userfiles/files/claim-gg-earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://www.aeroplanemarket.com/uploaded_files/userfiles/files/free-spins-coin-master-twitter_GM406889139.pdfIn PDF document text
    • https://www.aeroplanemarket.com/uploaded_files/userfiles/files/microsoft-rewards-robux_GM431946152.pdfIn PDF document text
    • https://www.aeroplanemarket.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • https://www.aeroplanemarket.com/uploaded_files/userfiles/files/how-to-cheat-in-roblox-mining-simulator_GM431946152.pdfIn PDF document text
    • https://www.aeroplanemarket.com/uploaded_files/userfiles/files/robux-free-robux_GM431946152.pdfIn PDF document text
    • https://www.aeroplanemarket.com/uploaded_files/userfiles/files/free-tiktok-followers_GM835599320.pdfIn PDF document text
    • https://www.aeroplanemarket.com/uploaded_files/userfiles/files/roblox-free-account-of-30-days_GM431946152.pdfIn PDF document text
    • https://www.aeroplanemarket.com/uploaded_files/userfiles/files/free-pants-roblox-boy_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_off00003238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3238 22008 bytes
SHA-256: b94a934c35f643efd23966342ec20bd1073aed3b56029ce467dc004cad5a5ed5
font_01_sfnt_off000062b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62B0 18900 bytes
SHA-256: d9b1d18d73ebf3024a99b1f2634b2a8546b01040038a1b372d73f70fabcc320f

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