Malicious PDF — malware analysis report

Static analysis result for SHA-256 8920f4e7ba5af5cc…

MALICIOUS

PDF

36.3 KB Created: 2021-07-03 14:02:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 670fac81614bf4eaaca11f4d39662966 SHA-1: aa0d17c7dcbf48c53aa4dabf8d3d555de28741f5 SHA-256: 8920f4e7ba5af5cc0814c748035c32b01e6d910135c21e0a8a3f60303303d717
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/coin-master-daily-gift-free-spins-and-coins-link-game-hack PDF link annotation
    • https://cosmosocean.com.tw/upload/files/hackear-juego-coin-master-espaol_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/robux-generator-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-pet-paradiese-hack_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/when-does-john-doe-hack-roblox_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-weight-lifting-simulator-afk-speed-cheats_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/thanos-t-shirt-roblox-free_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/unpatchable-new-noclip-not-cheat-engine-jailbreak-roblox-2021_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-free-spins-link-download-apk_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-robux-codes-2021-july_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-generate-free-coin-master-spin_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-get-free-robux-instintly-2021_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/roblox-how-to-get-free-robux-september-2021_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/robuxy-com-generator_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/mobile4free24com-robux-hack_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-hack-in-arsenal_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/game-give-free-robux_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
font_00_sfnt_off00003340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3340 23796 bytes
SHA-256: 33efae0486c751b21520cf94ee8af5930b2d85bbbd98939cf5e7eaca031bfcb1
font_01_sfnt_off00006983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6983 18940 bytes
SHA-256: a6c8f3ff8a0dea06235968dd24959468b5e0dd7d526557991a378f144c82e936

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