Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a99384e15be347…

MALICIOUS

PDF

48.6 KB Created: 2021-06-09 11:47:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1b6b8d40a2a588cbffaf51bd6ab9f595 SHA-1: 2676ff0fe60119d104219437ed06248f9920b43f SHA-256: a0a99384e15be347885a62ed0979ae00764d215cb5f89e95a5146ace9fe38d3e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to known malicious infrastructure, specifically promoting game hacks and cheats. The primary lure appears to be a 'free generator / game hack' for Roblox, directing users to a URL hosted on netcdn.tw. This suggests a phishing or social engineering attack aimed at tricking users into visiting malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/cheats-for-bloody-mary-roblox-game-hack In PDF document text
    • http://apd-ukraine.de/images/roblox-cheat-xbox-one_GM431946152.pdfIn PDF document text
    • http://apd-ukraine.de/images/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://apd-ukraine.de/images/tiktok-fans-free_GM835599320.pdfIn PDF document text
    • http://apd-ukraine.de/images/free-spin-coin_GM406889139.pdfIn PDF document text
    • http://apd-ukraine.de/images/coin-master-mod-version-free-download_GM406889139.pdfIn PDF document text
    • http://apd-ukraine.de/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://apd-ukraine.de/images/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://apd-ukraine.de/images/game-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://apd-ukraine.de/images/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://apd-ukraine.de/images/free-roblox-gear_GM431946152.pdfIn PDF document text
    • http://apd-ukraine.de/images/coin-master-free-spins-apple_GM406889139.pdfIn PDF document text
    • http://apd-ukraine.de/images/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://apd-ukraine.de/images/all-free-items-in-roblox_GM431946152.pdfIn PDF document text
    • http://apd-ukraine.de/images/robux-for-surveys_GM431946152.pdfIn PDF document text
    • http://apd-ukraine.de/images/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://apd-ukraine.de/images/coin-master-free-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://apd-ukraine.de/images/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://apd-ukraine.de/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://apd-ukraine.de/images/free-minecraft-education-edition_GM479516143.pdfIn PDF document text
    • http://apd-ukraine.de/images/how-to-hack-roblox-accounts-for-robux_GM431946152.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
font_00_sfnt_off00004fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FE4 26528 bytes
SHA-256: 0474d32a41de054943cb39523c48b1b427663bfc7494017713e93dc0119ed390
font_01_sfnt_off00008bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BF1 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9903 18996 bytes
SHA-256: a3d997e06eaabc33eb6ae86c71414a0f95856cc8d3e610adae4cd8a251695209

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