Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c38ad4d082d9fd…

MALICIOUS

PDF

43.7 KB Created: 2021-06-09 02:08:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e15240126f1edbbd42c970efd32a1aff SHA-1: ffc78c77b8a6bdf7653af8a00d114cb6a4c93106 SHA-256: 37c38ad4d082d9fd11bea2a5b72af2bb7627be468afb5cfaab43d5fc1a3852f5
200 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors and impersonates brands like Microsoft to lure users into clicking on them. The primary link, 'https://netcdn.tw/app/431946152/robux-cheat-engine-game-hack', is presented as a game hack generator, indicating a credential phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and embedded links strongly suggest exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/robux-cheat-engine-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/robux-cheat-engine-game-hack In PDF document text
    • https://www.tvoyo.tv/ckfinder/userfiles/files/coin-master-hack-online_GM406889139.pdfIn PDF document text
    • https://www.tvoyo.tv/ckfinder/userfiles/files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.tvoyo.tv/ckfinder/userfiles/files/pokemon-go-free-12k-eggs_GM1094591345.pdfIn PDF document text
    • https://www.tvoyo.tv/ckfinder/userfiles/files/lazyblocks-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tvoyo.tv/ckfinder/userfiles/files/best-free-minecraft-server-hosting-reddit_GM479516143.pdfIn PDF document text
    • https://www.tvoyo.tv/ckfinder/userfiles/files/coin-master-free-spins-and-coins-app_GM406889139.pdfIn PDF document text
    • https://www.tvoyo.tv/ckfinder/userfiles/files/coin-master-card-collection-hack_GM406889139.pdfIn PDF document text
    • https://www.tvoyo.tv/ckfinder/userfiles/files/coin-master-links-to-get-free-spins_GM406889139.pdfIn PDF document text
    • https://www.tvoyo.tv/ckfinder/userfiles/files/minecraft-xbox-one-code-free_GM479516143.pdfIn PDF document text
    • https://www.tvoyo.tv/ckfinder/userfiles/files/pubg-uc-not-received_GM1330123889.pdfIn PDF document text
    • https://www.tvoyo.tv/ckfinder/userfiles/files/hack-robux_GM431946152.pdfIn PDF document text
    • https://www.tvoyo.tv/ckfinder/userfiles/files/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.tvoyo.tv/ckfinder/userfiles/files/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tvoyo.tv/ckfinder/userfiles/files/free-tiktok-likes-2021_GM835599320.pdfIn PDF document text
    • https://www.tvoyo.tv/ckfinder/userfiles/files/ios-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.tvoyo.tv/ckfinder/userfiles/files/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tvoyo.tv/ckfinder/userfiles/files/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
    • https://www.tvoyo.tv/ckfinder/userfiles/files/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • https://www.tvoyo.tv/ckfinder/userfiles/files/roblox-hack-scripts-pastebin_GM431946152.pdfIn PDF document text
    • https://www.tvoyo.tv/ckfinder/userfiles/files/best-tricks-co-robux_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_off00004f68.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F68 24312 bytes
SHA-256: a95b8b92fd4ffcb1699beb6963a3109b0fde362726ea289a2d4ceebd0f13d085
font_01_sfnt_off000086a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86A0 18756 bytes
SHA-256: fc9409b3550d73ac0a339a4efc86a54a1a22c91af53e6421f477114a25109963

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