Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7a0766a62e6200…

MALICIOUS

PDF

43.0 KB Created: 2021-06-03 23:45:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 124a9f159a5cd5c061eed5fb723e1cdb SHA-1: 553aed23dcf57b61a32f970ed4147bd694e031c7 SHA-256: cf7a0766a62e62004f16f26cc73f5aa4dd8f3d825e12aea5d16183ee967efdbb
260 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 links. These links lead to redirectors and a large number of SEO-optimized PDF files, suggesting a campaign to distribute malware or lead users to scam pages. The document body contains obfuscated text and references to game hacks, aligning with the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

Heuristics 6

  • 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.
  • 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.
  • 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.online/app/406889139/coin-master-event-hack-game-hack In PDF document text
    • http://lib.mappifhui.org/repository/cute-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-hack-tool-access-online-generator_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-free-spins--spins_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/minecraft-java-hacks_GM479516143.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-do-you-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-to-change-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-to-get-free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-game-free_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-spin-app-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_004_off00004f9d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F9D 24116 bytes
SHA-256: 33384a1111e01ac60ffbf0745788d432f5f46490986311f056b0432cef5f9128
font_01_sfnt_off000086c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86C3 17828 bytes
SHA-256: 3aa3979f7db9db60f85c12743f17b039c262b8ea7d603c2f9581d8dcabd3843c

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