Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1aff64a7968912…

MALICIOUS

PDF

48.0 KB Created: 2021-06-09 14:07:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 00bd6260c00de45f1abe96640953bbb1 SHA-1: c8b6f3da23a520467d12811bc8c2ac5f06707e0b SHA-256: ef1aff64a7968912dd97824a6e5e46abf02b8b5da21daf9d98576f855a85d180
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a lure for game hacks, presenting a fake CAPTCHA to trick users into clicking a malicious link. This link redirects to further malicious content, likely for malware distribution or phishing. The document body and heuristics strongly indicate a social engineering tactic to drive user interaction with malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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.tw/app/431946152/roblox-jailbreak-hack-keycard-game-hack In PDF document text
    • https://mbbs.hr/files/free-roebucks_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-free-link-facebook_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/best-free-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-unlimited-spins-hack_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/minecraft-gun-mod-download-free_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/mcpe-hack-client_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/block-best-robux_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/op-rewards-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/apps-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/is-minecraft-free-on-ps4_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-get-free-airpods-tiktok_GM835599320.pdfIn PDF document text
    • https://mbbs.hr/files/minecraft-pvp-hacks_GM479516143.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_off00004cb0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CB0 32520 bytes
SHA-256: 256c6446018e801b2a32d2ef889cb41b765d6ddc2234dec4595f77ead9f8063a
font_01_sfnt_off000097be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97BE 18824 bytes
SHA-256: e3084b13b591c13ee05950e08be9c688ab69a0bab4a0bb7edd6f88f273a17eb3

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