Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3a0e37a788730b…

MALICIOUS

PDF

36.7 KB Created: 2021-07-03 22:07:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5f3333ba28b17ac1a4a4ba490f724ec5 SHA-1: 24e8fbe6edf37c3ed1f813e58f06bf076ed7e231 SHA-256: 4b3a0e37a788730bc07beb1c1b0ebe56d3ca9c937055699eacdcc62fe6622875
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to a malicious domain, masquerading as a game hack generator. The ML classifier strongly indicated maliciousness, and the document body reinforces the lure by mentioning 'Coin Master Collect Today Free Spin'. No scripts were extracted, but the primary attack pattern involves luring users to a malicious redirector.

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/406889139/coin-master-collect-today-free-spin-game-hack In PDF document text
    • https://perpustakaan.man2kotaserang.sch.id/repository/free-robux-100-works-no-human-verification_GM431946152.pdfIn PDF document text
    • https://perpustakaan.man2kotaserang.sch.id/repository/minecraft-pe-free-ios_GM479516143.pdfIn PDF document text
    • http://perpustakaan.man2kotaserang.sch.id/repository/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.man2kotaserang.sch.id/repository/pig-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.man2kotaserang.sch.id//repository/coin-master-free-bonus_GM406889139.pdfIn PDF document text
    • http://perpustakaan.man2kotaserang.sch.id/repository/how-to-use-cheat-engine-on-roblox-swordburst-2_GM431946152.pdfIn PDF document text
    • http://perpustakaan.man2kotaserang.sch.id//repository/get-minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.man2kotaserang.sch.id/repository/pubg-uc-quiz_GM1330123889.pdfIn PDF document text
    • https://perpustakaan.man2kotaserang.sch.id/repository/how-do-you-get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://perpustakaan.man2kotaserang.sch.id/repository/odyssey-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://perpustakaan.man2kotaserang.sch.id/repository/how-to-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.man2kotaserang.sch.id/repository/can-i-cheat-on-roblox-vip-servers_GM431946152.pdfIn PDF document text
    • http://perpustakaan.man2kotaserang.sch.id/repository/coin-master-hack-program_GM406889139.pdfIn PDF document text
    • https://perpustakaan.man2kotaserang.sch.id/repository/como-hackear-robux-en-roblox-con-cheat-engine-66_GM431946152.pdfIn PDF document text
    • http://perpustakaan.man2kotaserang.sch.id/repository/how-to-cheat-in-roblox-speed-simulator_GM431946152.pdfIn PDF document text
    • http://perpustakaan.man2kotaserang.sch.id/repository/fe-hacks-roblox-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.man2kotaserang.sch.id/repository/free-coins-for-coin-master-blogger_GM406889139.pdfIn PDF document text
    • http://perpustakaan.man2kotaserang.sch.id//repository/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.man2kotaserang.sch.id/repository/new-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.man2kotaserang.sch.id//repository/minecraft-modded-client_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_off000036aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x36AA 23616 bytes
SHA-256: 86d7d51fab23a13c9dde80383d6be322b8249fbe349cbde6466dff9c2edb6405
font_01_sfnt_off00006c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C25 18600 bytes
SHA-256: 9f0141af832a94a821a5611f1bf941e89b92ae493e4bc114a7de50135be697a7

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