Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dbee76b72805aa9…

MALICIOUS

PDF

41.2 KB Created: 2021-05-13 08:04:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e5cd930b376b3ebda7071843b7bc8510 SHA-1: 21780b3d809fd19c72a12e8bed54014478130799 SHA-256: 5dbee76b72805aa94a95567b42e437031befb9f65f2aadaf2adea379bbb78ee1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with promises of game hacks and free coins. The primary link, https://netcdn.xyz/app/406889139/how-do-i-get-free-coins-in-coin-master-game-hack, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to game hacks and the malicious URL, reinforcing the lure. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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.
  • 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/how-do-i-get-free-coins-in-coin-master-game-hack In PDF document text
    • http://mohacad.hu/images/best-free-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://mohacad.hu/images/minecraft-nintendo-switch-digital-code-free_GM479516143.pdfIn PDF document text
    • http://mohacad.hu/images/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://mohacad.hu/images/2021-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/archery-master-3d-coins-hack_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/coin-master-hack-2021-ios-download_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/free-robux-scam_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • http://mohacad.hu/images/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/coin-master-unlimited-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/free-spins-coin-master-without-survey_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/coin-master-daily-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/free-minecraft-java-code_GM479516143.pdfIn PDF document text
    • http://mohacad.hu/images/free-robux-kid-friendly-no-human-verification_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
stream_003_off00004885.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4885 24144 bytes
SHA-256: 4c76a51258e44248f4cf4e7396cb2f84a6dc8fca9e2feb776759bc5b50d98bc0
font_01_sfnt_off00007f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F75 18044 bytes
SHA-256: a7eb4611cc5e19625cbf9eb325c611c19de71162a0200f7ffd184f09f4ce8017

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