Malicious PDF — malware analysis report

Static analysis result for SHA-256 99cc99ad711e02d9…

MALICIOUS

PDF

35.8 KB Created: 2021-07-04 21:36:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ee56c33d3a16a40138d533346e77c21f SHA-1: 7bf43da5dfd07753f484e2886a27eb88dd3c1b8f SHA-256: 99cc99ad711e02d96a664dd51681a10c7e11f9ef44a15895334c799645a0beeb
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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 http://netcdn.tw/app/406889139/lucky-patcher-coin-master-hack-game-hack PDF link annotation
    • http://sttlets.education/senayan/repository/roblox-hack-generator-secret_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/bux-city-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/how-to-hack-roblox-games-on-ios_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/como-hackear-el-juego-coin-master-en-espaol_GM406889139.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/minecraft-linux-free_GM479516143.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/google-how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/free-robux-generator-no-human-verification-100_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/roblox-free-no-download_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/pubg-uc-100k_GM1330123889.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/roblox-ww2-cheats_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan//repository/how-to-download-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/auto-clicker-download-roblox-free_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/how-do-you-get-robux-unlimited-free_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/cheat-engine-roblox-code_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/is-roblox-on-xbox-one-free_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/rbxcashcom-watch-videos-complete-offers-withdraw-to-robux-for-free_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/roblox-hack-all-game-2021_GM431946152.pdfIn PDF document text
    • http://sttlets.education/senayan/repository/como-hackear-roblox-sin-descargas_GM431946152.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_002_off0000334a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x334A 23688 bytes
SHA-256: b5e94c994d5e20429c27e51461a18b1a5540079714eaa3d497d25ec3b8d9f9e7
font_01_sfnt_off00006871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6871 18644 bytes
SHA-256: 62d67ccd9da712bc6337db9d68f01eeacea3f740b309a08d4949e1f324755b54

Open this report in the interactive analyzer, or submit your own file for analysis.