Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d61874aaa427072…

MALICIOUS

PDF

46.5 KB Created: 2021-06-03 05:57:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 157dd396e352bdbb2c6db6bcecb63d2b SHA-1: b32a948213ac262bf327d05f4adcb64a8936e3b2 SHA-256: 6d61874aaa42707218941b78e51b8c0e0f4e7d119fadc9690aa7b5dbdbe826c3
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 0.9748

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-gameplay-game-hack PDF link annotation
    • http://lib.fisipumt.ac.id//repository/how-to-hack-coin-master-in-pc_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/minecraft-free-demo_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/2021-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/tiktok-free-ads_GM835599320.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-monster_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-domain-for-minecraft-server_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/robux-online_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/pokemon-go-free-app_GM1094591345.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-discord_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-app_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/will-minecraft-ever-be-free_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-roblox-generator_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/roblox-prison-life-hack_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/2021-free-coin-master-spins_GM406889139.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_off00004f50.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F50 25068 bytes
SHA-256: 373dbf9fe693d1bdb0bb87dd5038dce1a104d1a363d94ee6a5b48115456cf383
font_01_sfnt_off00008987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8987 2820 bytes
SHA-256: e5f6ec650849eefe6bc6a1649c2875ce35328d23e4196945bba66cc43e5a49d4
font_02_sfnt_off00009326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9326 18236 bytes
SHA-256: ad3c54622fe5860f441fa157cfd09fdd7391131bf21229add7d3bdfc0c26f4fb

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