Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e0159a6387f2040…

MALICIOUS

PDF

45.2 KB Created: 2021-06-09 02:06:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 64f91f19617f1b4b5aa651ef4262e8a7 SHA-1: 0b37ad3c62a416d029d6b0c2ce341e45f41dc593 SHA-256: 4e0159a6387f2040fd97f91cafbeba0de097d4dbe0ef8be2a7416ad2665d1505
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

This PDF document employs a lure related to game hacks and Roblox, directing users to a malicious URL. The primary malicious URL, https://netcdn.tw/app/431946152/how-to-spawn-models-in-roblox-with-hack-game-hack, is associated with both game hack lures and brand impersonation, specifically Amazon, for credential phishing. The document's structure and embedded links indicate an attempt to exploit user interest in free game-related content to redirect them to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • 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.
  • 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-spawn-models-in-roblox-with-hack-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
  • 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-spawn-models-in-roblox-with-hack-game-hack In PDF document text
    • http://bufbd.org/images/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/coin-master-hack-ios-app_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/code-free-robux_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/coin-master-free-spins-5-10-2021_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/easy-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/how-to-get-free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/coin-master-apk_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/roblox-dying-sound-free_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/free-robux-inago-goat_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/free-roblox-toy-codes_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/how-can-i-get-robux_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/how-to-get-free-tiktok-followers-without-verification_GM835599320.pdfIn PDF document text
    • http://bufbd.org/images/free-robux-com-no-verification_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
stream_004_off0000501e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x501E 27020 bytes
SHA-256: e63d7c24928f7cdcfca10ca8b1fa198bd6a25eb5dbee15767d7a992fe3c42c51
font_01_sfnt_off00008aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AA7 19480 bytes
SHA-256: a806668c7ecdd6b87d884b692dfb0ad3559ec2155718f10465466152849f0967

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