Malicious PDF — malware analysis report

Static analysis result for SHA-256 525c7fcd48ac18c5…

MALICIOUS

PDF

46.1 KB Created: 2021-06-03 06:47:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0310dd74515a180872a601cf18682413 SHA-1: 65f20820109327a48597897d6a488777ed1fac71 SHA-256: 525c7fcd48ac18c5fd37ac0ac00b0394a71617369bd0681462cd9df948d36617
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as "free generator / game hack" lures. The primary malicious URL identified is https://netcdn.online/app/406889139/coin-master-spins-for-free-game-hack. The document body and embedded URLs suggest a social engineering tactic to trick users into visiting these sites, likely for further malware delivery or phishing. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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 https://netcdn.online/app/406889139/coin-master-spins-for-free-game-hack In PDF document text
    • http://muslib.unmus.ac.id/repository/minecraft-wurst-hacked-client_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-roblox-clothes-and-hair_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-play-minecraft-with-friends-for-free_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/toolbox-for-minecraft-pe-mod-apk_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-spin-and-coins-fbid-links_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/aristois-minecraft-hack_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/roblox-adopt-me-hack_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004e9f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E9F 25832 bytes
SHA-256: 06bbb01f1bc3f361de166f758c166f492506238645dd3b8bc95c8722c0efa4ff
font_01_sfnt_off000088e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88E0 2820 bytes
SHA-256: e5f6ec650849eefe6bc6a1649c2875ce35328d23e4196945bba66cc43e5a49d4
font_02_sfnt_off0000927e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x927E 17884 bytes
SHA-256: f64f8d8cd546afe107dcd88d9ce91258665e3d619825ef5ba403a2abc0c27184

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