Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b8f7e4081c924b…

MALICIOUS

PDF

43.8 KB Created: 2021-05-15 03:00:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3611464de657aba78109d3e56da2e3d7 SHA-1: 877f3dcd8d28799b49db9dc62c554338dc999380 SHA-256: 88b8f7e4081c924b0964b89ecb23a4b9004581a3ee1573f874a23aabacb7d912
200 Risk Score

Malware Insights

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

This PDF document contains multiple links to known malicious redirectors and impersonates Facebook to lure users with promises of free Robux. The embedded URLs, such as 'https://netcdn.xyz/app/431946152/www-roblox-com-free-robux-game-hack', are designed to lead victims to phishing pages or download further malicious content. The document's structure and content strongly suggest a credential harvesting or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/www-roblox-com-free-robux-game-hack.
  • 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/www-roblox-com-free-robux-game-hack In PDF document text
    • http://www.niarads.com/images/how-to-earn-free-stars-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.niarads.com/images/coin-master-free-spins-and-coins-today_GM406889139.pdfIn PDF document text
    • http://www.niarads.com/images/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://www.niarads.com/images/static-moonactive-net-free-spins_GM406889139.pdfIn PDF document text
    • http://www.niarads.com/images/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://www.niarads.com/images/coin-master-spin-link-today_GM406889139.pdfIn PDF document text
    • http://www.niarads.com/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.niarads.com/images/coin-master-hack-programers_GM406889139.pdfIn PDF document text
    • http://www.niarads.com/images/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://www.niarads.com/images/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.niarads.com/images/100-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.niarads.com/images/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://www.niarads.com/images/how-to-get-java-minecraft-free_GM479516143.pdfIn PDF document text
    • http://www.niarads.com/images/minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://www.niarads.com/images/minecraft-pe-016-0-apk-download-free_GM479516143.pdfIn PDF document text
    • http://www.niarads.com/images/coin-master-free-attack-hack_GM406889139.pdfIn PDF document text
    • http://www.niarads.com/images/how-to-get-a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://www.niarads.com/images/free-robux-com_GM431946152.pdfIn PDF document text
    • http://www.niarads.com/images/fast-robux-online_GM431946152.pdfIn PDF document text
    • http://www.niarads.com/images/free-stuff-on-roblox-2021_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
font_00_sfnt_off00004d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D29 25268 bytes
SHA-256: 9d5734503ecbcedc17cfa4594116aae692e1951dc3ac758bc4ec9f3d31c802eb
font_01_sfnt_off000087af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87AF 18708 bytes
SHA-256: 62c028800c68fb05578d3bf96b402573c397accdba69624e3c020ffc1692f811

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