Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9cc957cd03fb47d…

MALICIOUS

PDF

34.3 KB Created: 2021-06-26 13:11:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 57cf455c69baed7f5e4339d9ee49e8b1 SHA-1: 1514a28e267b4e76f99e54a7d4a371dd696549b5 SHA-256: d9cc957cd03fb47d81b093922e1b29025c664af400d13d84bb87194d91ded668
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are disguised as game hacks or free item generators for popular games like Roblox and Coin Master. The primary heuristic indicates a 'PDF SEO Link Farm', suggesting the document's purpose is to drive traffic to these potentially malicious sites. The embedded URLs and the document body content strongly suggest a phishing or scam attempt, likely to lead users to download malware or provide personal information.

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.co/app/431946152/hacks-de-roblox-para-teletransportarse-game-hack PDF link annotation
    • https://cursocejas.com.br/imagens/userfiles/files/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/pig-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/minecraft-com-free_GM479516143.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/free-minecraft-skins-ps4_GM479516143.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/coin-master-gifts_GM406889139.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/how-to-get-free-robux-in-roblox-any-device_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/aves-magic-academy-hack-roblox_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/como-tener-robux-gratis-en-roblox-si-hacks_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/coin-master-hack-without-verify_GM406889139.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/how-do-you-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/gaming-app-cheats-roblox_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/50-free-tiktok-likes-trial_GM835599320.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/robux-converter_GM431946152.pdfIn PDF document text
    • https://cursocejas.com.br/imagens/userfiles/files/get-free-robux-without-human-verification_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_off00002fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FD8 22004 bytes
SHA-256: b56051eff908cb0e7c4acd41277d09b208edc28df68f945d29a0e3c22489c655
font_01_sfnt_off00006057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6057 19260 bytes
SHA-256: dd4f9aec4d4a9086f7be58f5219ffcaaf905a8e24e3127e8ccc6467585f07d97

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