Malicious PDF — malware analysis report

Static analysis result for SHA-256 25912b9a859e6da7…

MALICIOUS

PDF

35.5 KB Created: 2021-07-05 17:10:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: e7f85bb63feaad6b242a6b40ff30ded3 SHA-1: 2604f931bfa1fec44d223154f0b061d651559abe SHA-256: 25912b9a859e6da70cc6dc4296a556bf5293e482674b1a6fd024458a9b12237d
200 Risk Score

Malware Insights

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

This PDF document contains links that redirect to malicious infrastructure, specifically advertising free game currency or hacks. The primary link, http://netcdn.tw/app/431946152/free-robux-without-downloading-apps-game-hack, impersonates a brand to lure users into clicking, likely leading to credential phishing or further malware delivery. The document's content and heuristics strongly suggest a phishing or scam campaign.

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/free-robux-without-downloading-apps-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/free-robux-without-downloading-apps-game-hack In PDF document text
    • http://lib.untad.ac.id//repository/coin-master-free-spins-save_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/all-players-in-robloxs-passwords-password-hack_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-cheat-robux-free_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-play-roblox-on-xbox-360-for-free_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/hack-tools-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-hack-roblox-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-robux-games-that-work-2021_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/omplete-surveys-for-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/c7-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-hack-apk-35-33_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-robux-giveaway-no-hacks_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/kuso-icu-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/case-clicker-case-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/ultimate-driving-roblox-cheat-speeding_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-boy-hair-free_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/free-robux-no-download_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-get-free-robux-in-roblox-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/donne-du-t-shirt-hacker-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/minecraft-for-chromebook-free_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
font_00_sfnt_off0000316b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x316B 22180 bytes
SHA-256: 54a1227c5251779bd2a9f0bbf21cfae0597eb0179b2e464a16426ba2f590873f
font_01_sfnt_off00006298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6298 20060 bytes
SHA-256: 8436a460c804c08fe10423d7ff888b310581b803afefa6e8463990a0aaecc0a2

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