Malicious PDF — malware analysis report

Static analysis result for SHA-256 83de88aa51c26fa5…

MALICIOUS

PDF

42.3 KB Created: 2021-05-12 18:49:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: c8b8ad0cf7b9992f4cbfc3735d1eec59 SHA-1: 10cef2f27739d2d6d2073fc9e74ee768a9ebc86a SHA-256: 83de88aa51c26fa5ef2033e0e95a54765725a9b31165a73414e2279cf8a410ab
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains a lure for game hacks and displays a fake CAPTCHA to trick the user into clicking a malicious link. The link leads to a known malicious redirector infrastructure. No scripts were extracted, but the document body and heuristics indicate a social engineering attempt to drive users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/download-apps-for-robux-game-hack In PDF document text
    • http://agritrade-ukraine.com/images/minecraft-free_GM479516143.pdfIn PDF document text
    • http://agritrade-ukraine.com/images/coin-master-hack-trick-2021_GM406889139.pdfIn PDF document text
    • http://agritrade-ukraine.com/images/free-roblox-dominus_GM431946152.pdfIn PDF document text
    • http://agritrade-ukraine.com/images/coin-master-hack-2021-app-download_GM406889139.pdfIn PDF document text
    • http://agritrade-ukraine.com/images/toolbox-for-minecraft-pe-ios_GM479516143.pdfIn PDF document text
    • http://agritrade-ukraine.com/images/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://agritrade-ukraine.com/images/microsoft-roblox_GM431946152.pdfIn PDF document text
    • http://agritrade-ukraine.com/images/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://agritrade-ukraine.com/images/free-coin-spin_GM406889139.pdfIn PDF document text
    • http://agritrade-ukraine.com/images/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • http://agritrade-ukraine.com/images/rbx-claim_GM431946152.pdfIn PDF document text
    • http://agritrade-ukraine.com/images/demon-roblox_GM431946152.pdfIn PDF document text
    • http://agritrade-ukraine.com/images/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • http://agritrade-ukraine.com/images/robux-hack-tools_GM431946152.pdfIn PDF document text
    • http://agritrade-ukraine.com/images/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://agritrade-ukraine.com/images/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • http://agritrade-ukraine.com/images/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • http://agritrade-ukraine.com/images/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://agritrade-ukraine.com/images/minecraft-sign-up-free_GM479516143.pdfIn PDF document text
    • http://agritrade-ukraine.com/images/where-can-i-get-free-spins-for-coin-master_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_off00004715.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4715 24968 bytes
SHA-256: 1a79d61c414be5ade04681da79d19bc1375a6eb90fa47c6eec0c79e1936a7021
font_01_sfnt_off0000809d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x809D 18996 bytes
SHA-256: ea235c61f7ee6ff97cb8e2e4b8381115f9ce59fc272e8f2939e83a9622de1179

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