Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de3bc5d2cb104b9…

MALICIOUS

PDF

45.7 KB Created: 2021-06-03 09:18:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 18b533cafcd15abc999dc4145f9227cb SHA-1: 635b0a9a2289d0bb763dde82248ae7197453f9cb SHA-256: 3de3bc5d2cb104b93895b08ac2d12b5c9e40fecdca4218d44d69f75e2ed9af33
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 and lures users with a fake CAPTCHA, suggesting an attempt to trick users into downloading further malicious content or visiting malicious sites. The presence of embedded URLs and the fake CAPTCHA heuristic strongly indicate a phishing or social engineering attack. No scripts were extracted, but the document's structure and embedded links point towards a downloader or redirector pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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.online/app/1094591345/pokemon-go-free-trades-game-hack In PDF document text
    • http://lib.vipklh.ru/repository/coin-master-hack-tool-v1-9-pc_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/best-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-link_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-hack-version-download_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/minecraft-java-free-trial_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/get-more-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-online-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-24-7-minecraft-server_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-daily-rewards-link_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-game-hunters-club_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/is-coin-master-hack-safe_GM406889139.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_off00004de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DE2 23820 bytes
SHA-256: cdd14565b40987e396fde2c035707c3c382d0e4b639faf1759323bcae0dc6c4c
font_01_sfnt_off000083f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83F8 3436 bytes
SHA-256: 1600ed5457d66fe2ddcf38b6ddeebe8ea17fda951358b95b66841a3f7b36980d
font_02_sfnt_off00009013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9013 18244 bytes
SHA-256: 8657a42b980980d1f4450aa186a6474296c722852d82b14457773c912d780a6a

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