Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e269bde0981145b…

MALICIOUS

PDF

43.1 KB Created: 2021-05-16 12:37:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3be281c858d8a3520be5c5d6e1c6be51 SHA-1: ab6466a409fde86e653271f889c62f71ee547e07 SHA-256: 5e269bde0981145b7cb6ced77edd2b40d43bec4e4283973b21dd89345308c285
320 Risk Score

Malware Insights

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

The PDF document contains multiple links to external sites, including a known malicious redirector, masquerading as 'free generator' or 'game hack' lures. It also presents a fake CAPTCHA or human verification prompt to deceive users into interacting with these malicious links. The document's structure and content strongly suggest it's designed to lead users to potentially harmful websites, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 8

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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/free-ways-to-get-robux-game-hack In PDF document text
    • http://quatangthienthan.com/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://quatangthienthan.com/images/update-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://quatangthienthan.com/images/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://quatangthienthan.com/images/roblox-hack-scripts-pastebin_GM431946152.pdfIn PDF document text
    • http://quatangthienthan.com/images/how-to-get-free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • http://quatangthienthan.com/images/free-downloads-for-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://quatangthienthan.com/images/how-to-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://quatangthienthan.com/images/how-to-get-minecraft-on-chromebook-for-free_GM479516143.pdfIn PDF document text
    • http://quatangthienthan.com/images/minecraft-pe-free-apk_GM479516143.pdfIn PDF document text
    • http://quatangthienthan.com/images/robloxhacks_GM431946152.pdfIn PDF document text
    • http://quatangthienthan.com/images/minecraft-mod-menu-apk_GM479516143.pdfIn PDF document text
    • http://quatangthienthan.com/images/how-to-get-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://quatangthienthan.com/images/minecraft-java-edition-free-code_GM479516143.pdfIn PDF document text
    • http://quatangthienthan.com/images/coin-master-code-hack_GM406889139.pdfIn PDF document text
    • http://quatangthienthan.com/images/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://quatangthienthan.com/images/coin-master-free-cards-2021_GM406889139.pdfIn PDF document text
    • http://quatangthienthan.com/images/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://quatangthienthan.com/images/minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • http://quatangthienthan.com/images/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://quatangthienthan.com/images/latest-coin-master-free-spins-link_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_off00004aa7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AA7 25432 bytes
SHA-256: 82f7430ef4bdcdde25ce7ba67aacc5ec956312ac62533d9de8ced47b2687ac73
font_01_sfnt_off00008478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8478 18724 bytes
SHA-256: 4748f019d46a9554f00c7c8cf9bb59ec204dfb95bc520e2d25b5a7c8ef81b270

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