Malicious PDF — malware analysis report

Static analysis result for SHA-256 751e972ff8ecd85d…

MALICIOUS

PDF

45.7 KB Created: 2021-06-03 05:40:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 9fdda9daa8ed45ce1c797b903cc4f081 SHA-1: ace270fe0dd3c3e6bfc551306e717c69ac3bc943 SHA-256: 751e972ff8ecd85d57f96500c6ed718a47707569d4597919d1d809068e113048
200 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to trick users into interacting with malicious links. The primary link, https://netcdn.online/app/431946152/freerobloxde-hack-game-hack, is identified as a malicious redirector. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to exploit user interaction, likely leading to a second-stage download or exploit.

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/431946152/freerobloxde-hack-game-hack In PDF document text
    • http://www.perpus.stfm.ac.id/repository/free-robux-ad_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/how-to-hack-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-minecraft-bedrock-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/free-fire-vs-pubg-tik-tok_GM835599320.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/coinmaster-twitter_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/free-tiktok-followers-royal-key_GM835599320.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/coin-free-master_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-spins-and-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/coin-master-hack-ios-app_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/roblox-avatar-tester_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/coin-master-spin-ml_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/roblox-jailbreak-hack-download_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/roblox-catalog-free_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/password-free-roblox-accounts_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_off00005004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5004 24024 bytes
SHA-256: 03633e2fb9810d9f24c2289a7e05dacd4f6fde295a55e801d4b51ff5e3ae8a63
font_01_sfnt_off00008561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8561 2820 bytes
SHA-256: 34dd21cbcbbf8680f9624d5ddfa25e49232e6768200f74ddacb5347fd7a5f6dc
font_02_sfnt_off00008f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F02 18520 bytes
SHA-256: ddac04f38e8a1a8525baea36cf7a373bd3f0e384e8c1c29265f76692a152552c

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