Malicious PDF — malware analysis report

Static analysis result for SHA-256 a187eba75c9df0e5…

MALICIOUS

PDF

43.4 KB Created: 2021-05-15 07:25:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 7869784bb1e1911145878daf9943bd33 SHA-1: 0cd53ac63d4fc4268065943b4193ede1ce9d427f SHA-256: a187eba75c9df0e5969fab48010f861d29faf8978cdf3f6252e76b4d7e2fde56
122 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 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 5

  • 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/john-doe-roblox-hacker-game-hack PDF link annotation
    • https://www.xenonsvjetla.com/files/how-to-watch-ads-for-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.xenonsvjetla.com/files/minecraft-free-download-mac-full-version_GM479516143.pdfIn PDF document text
    • https://www.xenonsvjetla.com/files/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • http://xenonsvjetla.com/files/websites-for-robux_GM431946152.pdfIn PDF document text
    • https://www.xenonsvjetla.com/files/free-coin-master-spin-generator_GM406889139.pdfIn PDF document text
    • https://www.xenonsvjetla.com/files/roblox-old-avatar_GM431946152.pdfIn PDF document text
    • https://www.xenonsvjetla.com/files/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://www.xenonsvjetla.com/files/free-domain-for-minecraft-server_GM479516143.pdfIn PDF document text
    • http://xenonsvjetla.com/files/coin-master-hack-co_GM406889139.pdfIn PDF document text
    • https://www.xenonsvjetla.com/files/roblox-hack-scripts-pastebin_GM431946152.pdfIn PDF document text
    • https://www.xenonsvjetla.com/files/minecraft-windows-10-code-free_GM479516143.pdfIn PDF document text
    • http://xenonsvjetla.com/files/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • https://www.xenonsvjetla.com/files/spin-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.xenonsvjetla.com/files/hack-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.xenonsvjetla.com/files/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.xenonsvjetla.com/files/minecraft-pe-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • http://xenonsvjetla.com/files/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://xenonsvjetla.com/files/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://xenonsvjetla.com/files/minecraft-online-free-download_GM479516143.pdfIn PDF document text
    • http://xenonsvjetla.com/files/free-robux-no-survey-or-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
stream_003_off00004bd5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BD5 25248 bytes
SHA-256: f41f8b19fa7fc6434ee6d5656e0731bc4ea3af224649c43e94eb985daccb307c
font_01_sfnt_off00008637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8637 18680 bytes
SHA-256: fd443decf8178cd51ee717e0f89bd27a56480e9e0f5488a79ceaa3e76e017fae

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