Malicious PDF — malware analysis report

Static analysis result for SHA-256 204bb776be200790…

MALICIOUS

PDF

44.4 KB Created: 2021-05-10 21:07:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 702d75a8281f9a047051ae32e1a7e4d3 SHA-1: 3cc6d0b207edea15230e74386c34aaf60cb57924 SHA-256: 204bb776be200790bd0efed91ce963c5c6b78990f5645d4f5e295bea3d43c270
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 https://netcdn.xyz/app/431946152/free-robux-without-human-verification-game-hack PDF link annotation
    • http://bemviverclin.com.br/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://bemviverclin.com.br/images/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • http://bemviverclin.com.br/images/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • http://bemviverclin.com.br/images/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://bemviverclin.com.br/images/coin-master-free-spins-and-chips_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/coin-master-free-coins-hack_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/roblox-hacked-version-download_GM431946152.pdfIn PDF document text
    • http://bemviverclin.com.br/images/free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://bemviverclin.com.br/images/coin-master-free-spins-moonactive_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/coin-master-pro-hack_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/free-coins-and-spins-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bemviverclin.com.br/images/coin-master-hack-spins-apk_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/coin-master-game-free-spin-download_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/coinmasterdailyfreespins-com_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/coin-master-free-spin-link-today-download_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/robux-free-robux_GM431946152.pdfIn PDF document text
    • http://bemviverclin.com.br/images/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/free-robux-group_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
stream_003_off00004816.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4816 27916 bytes
SHA-256: 2f9689b2437ff6904b6ed7e3cff3bea4e323c965d432c4bea93fd80d6706575c
font_01_sfnt_off00008894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8894 19224 bytes
SHA-256: 69162c0303826e3a88150cee7b6b12b50ba56e04bc46253c0e5eb9f80ac8a399

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