Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0616cce83fb3998…

MALICIOUS

PDF

33.7 KB Created: 2021-07-04 19:37:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e9a18b6ca2eb4464b76e4f61d37acc87 SHA-1: 6a61cfd7cabf831367c82307fbf042eca0558ae1 SHA-256: a0616cce83fb3998d3a1b1fc3eb9a1117631f0189de351fdfddab6ebef1bb535
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting free game hacks and generators. The primary lure URL is http://netcdn.tw/app/431946152/actual-free-robux-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious redirector designed to trick users into visiting potentially harmful sites. The ML classifier strongly supports the malicious nature of this PDF.

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.tw/app/431946152/actual-free-robux-game-hack In PDF document text
    • http://cintabaca.org/katalog/repository/tlcharger-emperor-logiciel-hack-roblox_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-332-apk-free-download_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-roblox-money-2021_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/what-is-free-roblox-generator_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-admin-jailbreak-roblox_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/robux-boost_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/arsenal-roblox-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-robux-hack-generator-no-survey-2021_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-free-play-login_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/hack-gratui-pour-avoir-toute-les-gamepass-de-roblox-gratuite_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/roblox-free-items-2021_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/free-coin-master-spins-link-download_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/coin-master-free-spins-link-ios_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-app-hack_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/play-free-games-roblox-com_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_off00002fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FCE 21444 bytes
SHA-256: 7b3ae8ed9bd09bb5ce512b724d68817ffceef2959380b08c79c877b1f2734c30
font_01_sfnt_off00005eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EEE 18896 bytes
SHA-256: bd3de038992f776bb75c9d87ab01591e9a87ca5e55efa1086dfb4f2335c858c6

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