Malicious PDF — malware analysis report

Static analysis result for SHA-256 1766e9b052346e62…

MALICIOUS

PDF

44.5 KB Created: 2021-05-20 01:31:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f92d6eb1534c9c192dbefd7e1f0bc28a SHA-1: 53ef5043f198f7844b04457996e1facbb38eb77f SHA-256: 1766e9b052346e627cb96458f46e9bff434f5e90e02ac5ee1634b3d64919b9fa
182 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are presented as 'game hacks' or 'generators' for popular games like Coin Master and Roblox. The presence of a fake CAPTCHA heuristic suggests the document aims to trick users into performing an action, likely clicking these links. The ML classifier also flagged this PDF as malicious with high confidence. The document's structure and content indicate it's part of a link farm designed to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/get-free-lives-on-coin-master-game-hack PDF link annotation
    • http://eltisstudio.sk/images/coin-master-free-spins-link-2021-download_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://eltisstudio.sk/images/totally-free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/how-to-get-free-hair-in-roblox_GM431946152.pdfIn PDF document text
    • http://eltisstudio.sk/images/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/cute-free-roblox-clothes_GM431946152.pdfIn PDF document text
    • http://eltisstudio.sk/images/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://eltisstudio.sk/images/how-to-hack-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/legit-coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/how-to-get-free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://eltisstudio.sk/images/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://eltisstudio.sk/images/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • http://eltisstudio.sk/images/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://eltisstudio.sk/images/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://eltisstudio.sk/images/coin-master-daily-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://eltisstudio.sk/images/robux_GM431946152.pdfIn PDF document text
    • http://eltisstudio.sk/images/free-links-for-free-coins-and-spins-for-coin-master_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a07.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A07 23584 bytes
SHA-256: 97c36eb16f3f4de70d88590cd9523b07b4b60f0c4f3296d050d2353a6a682f86
font_01_sfnt_off00007f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F35 4020 bytes
SHA-256: dbaa9c12d07f3632734605f1d5d6dee3ad5af1f57488e46d95dab68b383f08c5
font_02_sfnt_off00008cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CBD 17824 bytes
SHA-256: 98e8fff89c022a83b4f395b71729b3265c44f0a4288b6eee3ecf04cc1aa00118

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