Malicious PDF — malware analysis report

Static analysis result for SHA-256 857b88a359efacac…

MALICIOUS

PDF

45.4 KB Created: 2021-05-15 15:43:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b29fb8d223f769c2da9e8a1f0e0ba03e SHA-1: 840757b850ca3da1887a7f738a69b090061c6a4c SHA-256: 857b88a359efacac0d43a3a5657de24b1ce08d575051464bda8a44076d6deffa
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector domains and specific game hack lures, indicating a social engineering attempt to trick users into visiting malicious sites. The ML classifier also flagged this PDF as malicious. The embedded URLs suggest a phishing or scam campaign, likely distributed as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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/free-coin-master-spins-no-verification-game-hack In PDF document text
    • http://safari-crimea.com/images/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://safari-crimea.com/images/coin-master-apk-free-download_GM406889139.pdfIn PDF document text
    • http://safari-crimea.com/images/roblox-install-free_GM431946152.pdfIn PDF document text
    • http://safari-crimea.com/images/free-shields-coin-master_GM406889139.pdfIn PDF document text
    • http://safari-crimea.com/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://safari-crimea.com/images/coin-master-free-spins-and-coins-app-download_GM406889139.pdfIn PDF document text
    • http://safari-crimea.com/images/coin-master-free-spins-and-coins-app_GM406889139.pdfIn PDF document text
    • http://safari-crimea.com/images/master-coin-free_GM406889139.pdfIn PDF document text
    • http://safari-crimea.com/images/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://safari-crimea.com/images/hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://safari-crimea.com/images/roblox-free-executor_GM431946152.pdfIn PDF document text
    • http://safari-crimea.com/images/coin-master-free-spins-save_GM406889139.pdfIn PDF document text
    • http://safari-crimea.com/images/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://safari-crimea.com/images/minecraft-hax-download-no-virus_GM479516143.pdfIn PDF document text
    • http://safari-crimea.com/images/clean-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://safari-crimea.com/images/coin-master-daily-free-spins-link-today-blogspot_GM406889139.pdfIn PDF document text
    • http://safari-crimea.com/images/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://safari-crimea.com/images/minecraft-alt-accounts-free_GM479516143.pdfIn PDF document text
    • http://safari-crimea.com/images/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://safari-crimea.com/images/coin-master-free-spins-link-2021-ios_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
stream_003_off00004a72.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A72 24264 bytes
SHA-256: 7b78e042b88b04facca158c4609ed94db1bc14f6c7ff56fff4b3fc731ba9cfcb
font_01_sfnt_off00008230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8230 4020 bytes
SHA-256: dbaa9c12d07f3632734605f1d5d6dee3ad5af1f57488e46d95dab68b383f08c5
font_02_sfnt_off00008fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FB8 18020 bytes
SHA-256: dd5f5b200dad3ed55c7c2e4b73125e453bab6792b82eb04fea180a40f9e0c889

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