Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1ec0704a4e8e63…

MALICIOUS

PDF

44.7 KB Created: 2021-05-17 15:31:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c841ad5814b1982f5a86c397b7d28194 SHA-1: 8e79673efcfb23470f5c4d6c55e5d9c245cd11a2 SHA-256: bc1ec0704a4e8e6391139f549a334da92621f7bbd9b4ccf265208d134c2feb63
200 Risk Score

Malware Insights

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

The PDF document contains multiple embedded links that lead to redirector infrastructure, masquerading as a fake CAPTCHA or human verification prompt to trick users. The ML classifier strongly indicated maliciousness, and the document body suggests a lure related to game hacks and free spins, which is a common social engineering tactic. No scripts were extracted, but the presence of malicious redirectors and the fake CAPTCHA lure suggest an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.xyz/app/406889139/50-000-free-spins-coin-master-game-hack In PDF document text
    • http://ratchadatitan.com/UserFiles/File/how-to-get-free-roebucks_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/free-robux-generator-codes_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/get-free-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/coin-master-free-spins-link-no-verification_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/how-to-make-roblox-clothes-for-free_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/roblox-free-online-game_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/grab-points-login_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/roblox-com-www_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/coin-master-hack-ios-no-human-verification_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/real-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/best-free-roblox-executor_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/synapse-roblox-free_GM431946152.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/mobihack-net-roblox-hack_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_off00004a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A9F 31376 bytes
SHA-256: 5c4747d1d2204a138fc06cd9c40d02ff36c2e518411c70ec3e71237ce344304f
font_01_sfnt_off00008cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CFF 18192 bytes
SHA-256: a4943b7840cd3959a8ceaa1ed690fa7e50048a9b71dafef76241fe8ac415bb35

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