Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f72b00d796027e…

MALICIOUS

PDF

34.5 KB Created: 2021-07-03 10:16:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d099b5d85ad6491657bd3dca29b172b4 SHA-1: f6bc93e2fba65f2415f4dc5ac3543cc240702c89 SHA-256: d4f72b00d796027ea215fa5380c3d65217261c57be00a3affd5480ca04196cdc
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document employs a game hack lure to redirect users to a network of link farms, as indicated by the PDF_GAME_HACK_REDIRECT_LURE and PDF_SEO_LINK_FARM heuristics. The embedded URLs, such as http://netcdn.co/app/431946152/what-games-give-you-robux-game-hack, likely lead to malicious content or phishing sites. The ML classifier also strongly indicated maliciousness.

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/what-games-give-you-robux-game-hack PDF link annotation
    • https://amiranet.com.br/files/files/free-roblox-wings_GM431946152.pdfIn PDF document text
    • https://amiranet.com.br/files/files/secret-robux-hack-subscribe-to-make-it-works_GM431946152.pdfIn PDF document text
    • https://amiranet.com.br/files/files/wurst-hacked-client_GM479516143.pdfIn PDF document text
    • https://amiranet.com.br/files/files/minecraft-story-mode-free-download_GM479516143.pdfIn PDF document text
    • https://amiranet.com.br/files/files/roblox-hack-mod-menu-android-2021_GM431946152.pdfIn PDF document text
    • https://amiranet.com.br/files/files/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • https://amiranet.com.br/files/files/free-roblox-gui-place_GM431946152.pdfIn PDF document text
    • https://amiranet.com.br/files/files/how-to-use-a-cheat-on-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://amiranet.com.br/files/files/free-robux-but-with-ransomware_GM431946152.pdfIn PDF document text
    • https://amiranet.com.br/files/files/hack-para-todos-los-juegos-de-roblox_GM431946152.pdfIn PDF document text
    • https://amiranet.com.br/files/files/free-spins-on-coin-master-cheat_GM406889139.pdfIn PDF document text
    • https://amiranet.com.br/files/files/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • https://amiranet.com.br/files/files/login-robux_GM431946152.pdfIn PDF document text
    • https://amiranet.com.br/files/files/how-to-change-your-username-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • https://amiranet.com.br/files/files/robux-hack-with-tampermonkey_GM431946152.pdfIn PDF document text
    • https://amiranet.com.br/files/files/black-t-shirt-free-roblox_GM431946152.pdfIn PDF document text
    • https://amiranet.com.br/files/files/how-to-get-roblox-20-package-for-free_GM431946152.pdfIn PDF document text
    • https://amiranet.com.br/files/files/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • https://amiranet.com.br/files/files/minecraft-gun-games-free_GM479516143.pdfIn PDF document text
    • https://amiranet.com.br/files/files/free-roblox-mouth-pack_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_off00002d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D3C 22832 bytes
SHA-256: 1730d99419d4aaf9c7aad7e644d0fc35fe0cacfdb9ce99229249c32409cae4fb
font_01_sfnt_off00005fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD6 19676 bytes
SHA-256: af41fe07397c949e73214349b68c8a9fd3ee583f455cb3bcb8d1107004dc07c8