Malicious PDF — malware analysis report

Static analysis result for SHA-256 172f867e7f90bc92…

MALICIOUS

PDF

47.5 KB Created: 2021-06-04 00:33:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: dd70483fc71f2cd694d869f7a685c77e SHA-1: 676c50b51811f4bc600b168d5b7fbb9c407bf5d2 SHA-256: 172f867e7f90bc9297a845f6578f1a2c6163f6501b477cec6497a8ef331fbdda
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 0.9769

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-best-link-game-hack PDF link annotation
    • http://digilib.unla.ac.id/repository/master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/tiktok-likes-for-free_GM835599320.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-free-spin-today-2021_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-free-spins-deutsch-download-2021-link_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-unlimited-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/roblox-avatar-free_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-minecraft-java-edition-codes_GM479516143.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/master-coin-hack-game_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://digilib.unla.ac.id/repository/minecraft-pe-free_GM479516143.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_off000052a5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52A5 25392 bytes
SHA-256: 11c1acc406733024ad176174ceb0f84a7b9fad3a610e101d9982db83f99479bb
font_01_sfnt_off00008d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D5B 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off0000970e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x970E 18272 bytes
SHA-256: 8a31c54044149911a6fa28f8dfc522cb0f86766aa8a76eab7955d7cdf147049f

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