Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c260faf8b8fdd25…

MALICIOUS

PDF

33.4 KB Created: 2021-07-03 14:21:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 65c4d84f3610b13fcd18f8585680f34a SHA-1: 0cb4a223237c7ca6fcec2bedea3cf619e32a0245 SHA-256: 5c260faf8b8fdd2586bbc6f59895b6777c4398dad847d03c9fd8c106b65e4ec7
200 Risk Score

Malware Insights

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

This PDF document employs a lure to trick users into clicking a link for 'free generators' or 'game hacks', which redirects to malicious infrastructure. The primary redirector URL is http://netcdn.tw/app/431946152/no-robux-game-hack, and the overall workflow appears to be credential phishing, impersonating brands like Facebook. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a malicious redirector chain designed to lead users to phishing pages.

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.
  • 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: http://netcdn.tw/app/431946152/no-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 http://netcdn.tw/app/431946152/no-robux-game-hack In PDF document text
    • http://gornjastubica.hr/files/free-expert-scripters-roblox_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/roblox-tower-battles-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/adidas-roblox-shirt-free-design-high-resoulution_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/coin-master-free-spins-5-10-2021_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/adonis-roblox-hack_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/how-to-get-free-items-on-roblox-no-hack_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/free-exploits-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/hacker-minecraft-song_GM479516143.pdfIn PDF document text
    • http://gornjastubica.hr/files/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • https://www.gornjastubica.hr/files/coin-master-fun-hack_GM406889139.pdfIn PDF document text
    • http://gornjastubica.hr/files/wish-free-robux_GM431946152.pdfIn PDF document text
    • http://gornjastubica.hr/files/are-pubg-uc-cheap_GM1330123889.pdfIn PDF document text
    • http://gornjastubica.hr/files/free-dominus-userscript-roblox_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_off00002e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E93 21912 bytes
SHA-256: f684f3a8060faff198afc610f692609191bfad92fa19eeabff65ea8bcc0c03ab
font_01_sfnt_off00005ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EE7 18552 bytes
SHA-256: 42f97b65938d735e66cc354ac71b77d37a57ba99840a78ecbd6a8ba6c2fcf8a0

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