Malicious PDF — malware analysis report

Static analysis result for SHA-256 2516c8e59d7457d3…

MALICIOUS

PDF

41.8 KB Created: 2021-05-17 20:42:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3872ed78fbe1b465f5c508d0db72c063 SHA-1: c55c39ea14c15a507ea3e6eff0849d1b6a92f653 SHA-256: 2516c8e59d7457d358f5cbb1d152617126a059dfdd4b43871ebbb3b01a0097c3
122 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to trick users into interacting with malicious content. It contains multiple embedded URLs, including one pointing to a game hack generator, which likely serves as a delivery mechanism for further malicious payloads. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/406889139/coin-master-homepage-game-hack PDF link annotation
    • https://loba.com.vn/public/upload/files/minecraft-free-school_GM479516143.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-rewards-2021_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-spins-and-coins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/claim-free-robux_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/how-do-you-hack-minecraft_GM479516143.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-hack-iosgods_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-spins-and-coins-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/jailbreak-script_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coins-master-hacks_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/claim-robux_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-hack-reddit_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-spins-and-coins-from-coin-master-game_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-robux-no-gift-card_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_off0000481a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x481A 24676 bytes
SHA-256: a9d17b06852c69a1d317cb56d8cb0cc17527d9aea60962365c84f71c75a5d6db
font_01_sfnt_off000080c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80C5 18272 bytes
SHA-256: 52ebbe1a6e32e78051c45f89c5d9c36e23c607fff486e02539fc8f460cac04ef

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