Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a0374c720ba8bac…

MALICIOUS

PDF

52.8 KB Created: 2021-06-03 07:36:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: b8719006ab692bc1d183c5584512db5f SHA-1: 87e348f5bc4aec79cd56f2e72379d96c905cb7c5 SHA-256: 6a0374c720ba8baca6e2f0cf120d80a914d18d801d540f23a24523cc8e8d538e
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-free-spin-today-game-hack PDF link annotation
    • http://library.smpn2-byl.sch.id//repository/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/how-to-get-free-cards-sets-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/earn-robux_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/como-hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/minecraft-hack-2021_GM479516143.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/freespincoin-masterlinkdownload_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id/repository/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/easy-roblox-today_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/free-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/coin-master-free-spin-links-december-30-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005123.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5123 30708 bytes
SHA-256: df07e5c7187ea89e44fd4ce6f327990a2afeba915c819eca715691be607a44bb
font_01_sfnt_off00009426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9426 4028 bytes
SHA-256: 6a4891da4f8b73c02e22ecd6fa566d6bb4f5f2d5575b30a343f3d3c5e0919267
font_02_sfnt_off0000a1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA1C9 2788 bytes
SHA-256: 6fd7c7f447d66842f81aa8cf197935b17f22157d0c7e9f95622df1b5b4ddf530
font_03_sfnt_off0000abb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABB9 18240 bytes
SHA-256: a96ac7afd25cadbabafd1b9dbf0a180d0c1833ed2d07acb4363f122556c39d20

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