Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a6e6fdb28e5397…

MALICIOUS

PDF

32.6 KB Created: 2021-07-04 12:38:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 1e35a9b417727b2280fe4663c41a78a4 SHA-1: 1e8f89a0cf2b4ae9ccde9565ca597f185fd42225 SHA-256: 73a6e6fdb28e5397db2d93428b7058df145887e3e63a69a93f32a63ed2d2e2e6
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, masquerading as generators for in-game currency or game hacks. The document body and heuristics indicate a fake CAPTCHA or human verification prompt is used to trick users into interacting with these links. The primary URL identified is http://netcdn.tw/app/431946152/free-robux-no-download-game-hack, which is associated with known malicious redirector activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/free-robux-no-download-game-hack In PDF document text
    • http://gts.edu.gh/library/repository/free-roblox-clothes-codes_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-hair-roblox-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/como-instalar-hacks-de-roblox-en-infinite-anime_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/minecraft-free-online-games_GM479516143.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/moonactive-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-hack-client_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/best-free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/toolbox-for-minecraft_GM479516143.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/hack-robux-gratis-sin-pastebin-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-super-power-training-simulator-vip-servers-roblox_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-is-bloxburg-free_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/minecraft-bedrock-free-download_GM479516143.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/1x1x1x1-roblox-id_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/hackear-coin-master_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-script-hack-admin_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_off00002a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A00 21664 bytes
SHA-256: 85c6b21ef1328d25d3be53b51a9591a49c835a217572a5ba8fb353bd75048262
font_01_sfnt_off00005998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5998 19296 bytes
SHA-256: 673f58843918fec7fc82dc93eb19a7c859fa60c1e628ed96b3248d818383844d

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