Malicious PDF — malware analysis report

Static analysis result for SHA-256 890121930e0ead18…

MALICIOUS

PDF

41.8 KB Created: 2021-05-19 15:44:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f109b4f992f298173cb18943b4dad71a SHA-1: 54498913e35bc2190eeb0b468404eb3b37052603 SHA-256: 890121930e0ead18929b4775cc931ba5516d4a474de0787d14a785bee233055c
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 'free coins' and 'game hacks'. The primary link directs to a URL associated with malicious redirector infrastructure. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lure suggest an attempt to download a second-stage payload or redirect the user to a phishing or malware distribution site.

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/free-coins-coin-master-spins-game-hack In PDF document text
    • http://cosver.eu/images/how-to-get-free-hair-in-roblox_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/coin-master-hack-no-verify_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/coin-master-codes_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/how-to-make-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://cosver.eu/images/free-robux-app-real_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/roblox-exploit-scripts_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/roblox-adopt-me-free-pets_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/working-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/minecraft-free-school_GM479516143.pdfIn PDF document text
    • http://cosver.eu/images/free-apk-mods-coin-master_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/best-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://cosver.eu/images/best-free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://cosver.eu/images/toolbox-for-minecraft_GM479516143.pdfIn PDF document text
    • http://cosver.eu/images/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/free-roblox-characters_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/daily-free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004790.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4790 25644 bytes
SHA-256: a4b80908a7030099376677b26ea46f819db8b221ccc1df09f5e23f2b844756df
font_01_sfnt_off0000820c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x820C 17884 bytes
SHA-256: 2acdf213e8e807bc487a80aadd43e8577e55ab076d243b65afc8816f4882cfa2

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