Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd81ab039e28128…

MALICIOUS

PDF

45.6 KB Created: 2021-06-03 07:26:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 111a71cbeb7397fcc2e5ccdaf39207a3 SHA-1: e1b222a0a89c7fe29dcadae7199db95073dbf483 SHA-256: 9cd81ab039e2812841b2003a5ab7edd2c5a2c85e9f190c8262c294c4787a66f1
160 Risk Score

Malware Insights

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

This PDF document employs a lure for free game currency or hacks, directing users to a malicious redirector. The embedded link, 'https://netcdn.online/app/835599320/free-tiktok-followers-app-game-hack', is flagged as malicious infrastructure. The document's structure and embedded links suggest an attempt to exploit user interest in free in-game items to redirect them to potentially harmful content or further malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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.online/app/835599320/free-tiktok-followers-app-game-hack In PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/free-roblox-groups_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/free-roblox-cards-pin-number_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/coin-master-home_GM406889139.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/robux-redeem_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/coin-master-free-spins-link-2021-ios_GM406889139.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/free-mods-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/minecraft-tower-defense-2-hacked_GM479516143.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/clean-master-coins-hack_GM406889139.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/rare-free-links-to-coin-master_GM406889139.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/coin-master-time-hack-ios_GM406889139.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/free-coin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/hack-coin-master-site-rssingcom_GM406889139.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/free-minecraft-domain_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004daa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DAA 24744 bytes
SHA-256: b477fa40b3f27ef9a028265be406d1dfddb984d7aa7dd06736092a2967f6a204
font_01_sfnt_off00008653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8653 2944 bytes
SHA-256: 4ef1d5bf19bd5f342816f6b2059876b3c5b1648586814d5cb02a95c19c99ec35
font_02_sfnt_off0000907f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x907F 17872 bytes
SHA-256: 34129f1c56e014fb2604607ed740d581eed4f4cd55f156cb19b3173e06165e4c

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