Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5cd465ddadbdbba…

MALICIOUS

PDF

34.5 KB Created: 2021-06-18 04:25:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2873cf1dd860a10bc9d60ce42b139052 SHA-1: 28b95dd7d61771cf5b5d68414f07144031a77f7f SHA-256: a5cd465ddadbdbba9d4eb948f37fc24d46a655c3a7ee39028bd6d9d0c406ae97
182 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 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 http://netcdn.co/app/431946152/roblox-restaurant-tycoon-money-cheat-2021-game-hack PDF link annotation
    • http://hardbit.cn/images/coin-master-hack-spins-app_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/free-outfits-roblox_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/roblox-com-roblox-play-for-free_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/coin-master-hack-mod-apk-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/lastrick-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/roblox-emergency-response-liberty-county-free_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/free-minecraft-alt-accounts_GM479516143.pdfIn PDF document text
    • http://hardbit.cn/images/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/tiktok-likes-free_GM835599320.pdfIn PDF document text
    • http://hardbit.cn/images/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/roblox-hack-server_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/how-to-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/hackear-juego-coin-master_GM406889139.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_off00002f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F74 21964 bytes
SHA-256: f076fa41dd821b88977de3281033e4581cb30332c2142467c2b43bae51923c58
font_01_sfnt_off0000602c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x602C 19488 bytes
SHA-256: a9cd408bd52800f0ce25c53e15ffd1e7d904a53938f6fbbb0e31395b27a31018

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