Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f2b5cac5987db65…

MALICIOUS

PDF

44.5 KB Created: 2021-06-09 12:13:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: bdf50bbc71f01e6527946be5061a616d SHA-1: 887226e0d3e821b5c9f035610476d6e970c5ce4e SHA-256: 6f2b5cac5987db6525fe940b56d659a53eae80233e0d9dc22be706c31f9b308a
240 Risk Score

Malware Insights

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

This PDF document is designed as a lure, presenting a fake CAPTCHA and impersonating eBay to trick users into clicking a malicious link. The primary link, 'https://netcdn.tw/app/431946152/roblox-hacker-melden-game-hack', redirects to further malicious content, likely to download a second-stage payload or conduct credential phishing. The document's content and heuristics strongly indicate a phishing and redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 6

  • 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
  • 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.tw/app/431946152/roblox-hacker-melden-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.tw/app/431946152/roblox-hacker-melden-game-hack In PDF document text
    • http://www.fluidtech.hu/images/free-tiktok-followers-no-human-verification-or-survey-2021_GM835599320.pdfIn PDF document text
    • http://www.fluidtech.hu/images/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.fluidtech.hu/images/roblox-cheat-codes_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/ezekiel-how-to-change-your-roblox-name-for-free_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://www.fluidtech.hu/images/free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/http-blackgamesus-coinmasterhack_GM406889139.pdfIn PDF document text
    • http://www.fluidtech.hu/images/coin-master-free-spins-glitch_GM406889139.pdfIn PDF document text
    • http://www.fluidtech.hu/images/roblox-robux_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/best-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://www.fluidtech.hu/images/get-robux-com_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/how-to-hack-roblox-using-lucky-patcher_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/hack-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.fluidtech.hu/images/minecraft-name-tag-hacks_GM479516143.pdfIn PDF document text
    • http://www.fluidtech.hu/images/coin-master-free-spins-link-deutsch-ios_GM406889139.pdfIn PDF document text
    • http://www.fluidtech.hu/images/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • http://www.fluidtech.hu/images/wurst-mc_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_off00005218.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5218 24592 bytes
SHA-256: d6aeb748a2295abd6e4077d250adb4d50de88070e918820dbf6c2f526877a5b8
font_01_sfnt_off00008a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A93 18552 bytes
SHA-256: 2f90dd285a2e90a7fb24c23892d2014e30cdaa46a83f75cdedfb4b3744acc621

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