Malicious PDF — malware analysis report

Static analysis result for SHA-256 17902035b486911b…

MALICIOUS

PDF

48.9 KB Created: 2021-06-09 03:54:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 030dde2304daf49b2563b23d7a989e6a SHA-1: 0cb7bb82e7b18299801f83ab1912ae1d288d5586 SHA-256: 17902035b486911be6a086c006e39c264d1e67f1407b72b0a4298df2ade0ac5a
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors, masquerading as game hacks and generators. The document body and heuristics indicate a fake CAPTCHA or human verification prompt is displayed to trick users into interacting with these malicious links. The primary malicious action observed is the redirection to potentially harmful infrastructure, likely to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.tw/app/431946152/roblox-5x-coins-anime-cross-hack-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-that-actually-works_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-download-free-download_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-bux-free_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/tiktok-free-no-download_GM835599320.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/www-rubux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-500-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-link-2021-app_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/my-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-rare-cards_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-spins-coinmaster_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-spin-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-attack-madness-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-free-skins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-tool-without-human-verification_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-link-cheat_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-free-followers_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_off00005121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5121 26388 bytes
SHA-256: 313fc7fcc8afa7a5edaa799513b9eda26a40e0440a3491b9a89dd4e655232141
font_01_sfnt_off00008e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E17 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B28 18696 bytes
SHA-256: ed6c5a82a0b0fd1f8ed31a5263cbd3363ef65b3ad72fe48ba7e69fdb895b9f8e

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