Malicious PDF — malware analysis report

Static analysis result for SHA-256 becdb66408c4fcf6…

MALICIOUS

PDF

43.7 KB Created: 2021-05-13 05:32:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 62320b809e052d74e1bace6f96c9f0d6 SHA-1: 46d637d5d5695ec746a8d270a4829b25366be5b0 SHA-256: becdb66408c4fcf6180e01d41002c389811e416459daddac377f2545c97408a5
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 0.9969

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 https://netcdn.xyz/app/431946152/roblox-hack-2021-game-hack PDF link annotation
    • http://bemviverclin.com.br/images/minecraft-java-edition-code-free_GM479516143.pdfIn PDF document text
    • http://bemviverclin.com.br/images/hack-the-game-coin-master_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/coin-master-hack-without-verify_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/websites-for-robux_GM431946152.pdfIn PDF document text
    • http://bemviverclin.com.br/images/free-coins-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/coin-master-free-spins-daily-fb-champion_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/www-cheatsk-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://bemviverclin.com.br/images/free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://bemviverclin.com.br/images/minecraft-hacks-xbox_GM479516143.pdfIn PDF document text
    • http://bemviverclin.com.br/images/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://bemviverclin.com.br/images/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • http://bemviverclin.com.br/images/how-to-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://bemviverclin.com.br/images/free-roblox-svg_GM431946152.pdfIn PDF document text
    • http://bemviverclin.com.br/images/how-much-robux-can-you-get-with-1-million-dollars_GM431946152.pdfIn PDF document text
    • http://bemviverclin.com.br/images/coin-master-daily-spin-link_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/roblox-password-hacker_GM431946152.pdfIn PDF document text
    • http://bemviverclin.com.br/images/coin-master-free-spin-and-coin-links_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
stream_003_off00004a12.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A12 26316 bytes
SHA-256: 9daac0c94282b4aac6b25810769affb5e39c31ae63b52032c1959f195b86c25e
font_01_sfnt_off00008731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8731 18584 bytes
SHA-256: 2941163c9806e22b58ea5552aa71059231a9f2c3bbffbca0ecd460ca17501cff

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