Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d020db901e23f7f…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 02:21:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b2213991d6d00175fddcc074bb593b03 SHA-1: 4a1430649909c885af83284afddf5ca5be75e8ae SHA-256: 6d020db901e23f7fba98c155ba195ff8b1cfd8d8b3fc7caeda7ee6aa11f18288
160 Risk Score

Malware Insights

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

The PDF file contains multiple links to a redirector URL that masquerades as a game hack or generator, specifically mentioning 'free Robux'. This heuristic, combined with the ML classifier flagging the PDF as malicious, strongly suggests a social engineering lure to trick users into downloading or executing further malicious content. The primary IOC is the redirector URL used in the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/how-can-i-get-free-robux-game-hack In PDF document text
    • http://lib-smansumsel.sch.id/repository/is-coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/minecraft-114-4-download_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/shark-bite-hacks-roblox-script_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/cool-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox-one-piece-golden-age-cheat-engine_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-game-2021-free-spin-link_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/minecraft-windows-10-mod-menu_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox-com-hack_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox-cash-grab-simulator-cheat_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/get-coin-master-cards-free_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/tower-of-hell-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-make-clothes-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/minecraft-pe-017-0-apk-free-download-android_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-coins-for-planet-master-game_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-download-hack_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-daily-gift-free-spins-and-coins-link-today_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
font_00_sfnt_off00003140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3140 22128 bytes
SHA-256: 1039d19a30fab6307a22e2096599ffc62a98f6ad06bc4328203e11a614a0897b
font_01_sfnt_off0000624b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x624B 18984 bytes
SHA-256: 88d69eb3e5aacbb9415b7e9d5cab519469ee3fdfdf18acc61836835876a3bab2

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