Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8cb3fa4cf53b4d4…

MALICIOUS

PDF

45.2 KB Created: 2021-06-11 05:21:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0cc4ec989536816a0bf80af864414c9e SHA-1: a44f8e084b5a28e80df118b4935cf0ee4ea5b6e6 SHA-256: d8cb3fa4cf53b4d49696da6a91f225913ec6b45542f924dcfa116ec1d026485b
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors, disguised as game hacks and currency generators. The primary lure URL is https://netcdn.tw/app/431946152/backdoor-currency-increase-roblox-hack-game-hack. While no scripts were extracted, the document's structure and embedded links strongly suggest it's designed to trick users into visiting malicious sites, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/backdoor-currency-increase-roblox-hack-game-hack In PDF document text
    • http://schoolsupportandbeyond.org/images/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://schoolsupportandbeyond.org/images/roblox-skins-boy-free_GM431946152.pdfIn PDF document text
    • http://schoolsupportandbeyond.org/images/mcpe-master-coin-hack-apk_GM406889139.pdfIn PDF document text
    • http://schoolsupportandbeyond.org/images/free-robux-codes-2021-pastebin_GM431946152.pdfIn PDF document text
    • http://schoolsupportandbeyond.org/images/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • http://schoolsupportandbeyond.org/images/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • http://schoolsupportandbeyond.org/images/is-roblox-free-on-nintendo-switch_GM431946152.pdfIn PDF document text
    • http://schoolsupportandbeyond.org/images/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://schoolsupportandbeyond.org/images/roblox-rhythm-track-cheat_GM431946152.pdfIn PDF document text
    • http://schoolsupportandbeyond.org/images/free-tiktok-followers-no-verification-or-survey_GM835599320.pdfIn PDF document text
    • http://schoolsupportandbeyond.org/images/coin-spin_GM406889139.pdfIn PDF document text
    • http://schoolsupportandbeyond.org/images/free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://schoolsupportandbeyond.org/images/how-to-hack-coin-master-ios-jailbreak_GM406889139.pdfIn PDF document text
    • http://schoolsupportandbeyond.org/images/minecraft-bedrock-edition-pc-download-free_GM479516143.pdfIn PDF document text
    • http://schoolsupportandbeyond.org/images/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://schoolsupportandbeyond.org/images/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://schoolsupportandbeyond.org/images/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://schoolsupportandbeyond.org/images/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://schoolsupportandbeyond.org/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://schoolsupportandbeyond.org/images/coin-master-daily-free-spins-link_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_off000050f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50F4 25952 bytes
SHA-256: 73fc32a08407371b7ab5f56bc124f6a7a8c8bd97430012fa731559c7e79bc61d
font_01_sfnt_off00008cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF4 18676 bytes
SHA-256: ef130dc9a66f5aad819f4b3c65a279a847738515854dcb61878b58d2fbd74378

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