Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d5125265335b65…

MALICIOUS

PDF

44.7 KB Created: 2021-05-12 18:03:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5e16c42d40d425a51f6ffd14cbfd9aac SHA-1: 0bb76ed68183950b09bf8bda9568c81fdb9d842c SHA-256: b5d5125265335b65b817f9f13325d0f0eb83238ab24b5c439724289e481c6382
200 Risk Score

Malware Insights

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

The PDF document contains links to known malicious redirectors, masquerading as a 'free generator / game hack'. It also displays a fake CAPTCHA to trick users into clicking these links, which likely leads to further malicious content or downloads. The ML classifier strongly indicated maliciousness, supporting the observed redirection and lure techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/how-to-get-more-robux-for-free-game-hack In PDF document text
    • https://eurekaaccounting.co.za/images/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • https://eurekaaccounting.co.za/images/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • https://eurekaaccounting.co.za/images/minecraft-hacker-mask_GM479516143.pdfIn PDF document text
    • https://eurekaaccounting.co.za/images/game-give-free-robux_GM431946152.pdfIn PDF document text
    • https://eurekaaccounting.co.za/images/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • https://eurekaaccounting.co.za/images/robux-converter_GM431946152.pdfIn PDF document text
    • https://eurekaaccounting.co.za/images/coin-master-free-download_GM406889139.pdfIn PDF document text
    • https://eurekaaccounting.co.za/images/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://eurekaaccounting.co.za/images/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://eurekaaccounting.co.za/images/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://eurekaaccounting.co.za/images/coin-master-spin-hack-pc_GM406889139.pdfIn PDF document text
    • https://eurekaaccounting.co.za/images/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • https://eurekaaccounting.co.za/images/earn-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://eurekaaccounting.co.za/images/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • https://eurekaaccounting.co.za/images/guide--coin-master-free-tips_GM406889139.pdfIn PDF document text
    • https://eurekaaccounting.co.za/images/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://eurekaaccounting.co.za/images/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • https://eurekaaccounting.co.za/images/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://eurekaaccounting.co.za/images/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://eurekaaccounting.co.za/images/roblox-hack-ga_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_off00004c97.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C97 27260 bytes
SHA-256: 1d69c2054fc125bf34a4d6efe914935d9508b6885ed1aedc24f047ee3e097a45
font_01_sfnt_off00008c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C06 18480 bytes
SHA-256: 444f48c68388f928a3d871611d0873030738946ead4f6691d00c6869f71b1127

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