Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b17df06612b9041…

MALICIOUS

PDF

45.7 KB Created: 2021-05-13 23:33:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2d0e659c851dc05775dd2cbdf1f1d00b SHA-1: 8962a10f3118e89ba3164688b69982c3ffe04668 SHA-256: 8b17df06612b90417966431f49ee8da04f8ad0955499124718b068c54f6be531
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 0.9507

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.xyz/app/431946152/how-to-make-free-robux-game-hack PDF link annotation
    • https://tckontrola.hr/files/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • https://tckontrola.hr/files/how-to-get-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • https://tckontrola.hr/files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • https://tckontrola.hr/files/coin-master-free-spins-link-fb_GM406889139.pdfIn PDF document text
    • http://tckontrola.hr/files/coin-master-support_GM406889139.pdfIn PDF document text
    • https://tckontrola.hr/files/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://tckontrola.hr/files/add-robux_GM431946152.pdfIn PDF document text
    • https://tckontrola.hr/files/free-minecraft-survival-server_GM479516143.pdfIn PDF document text
    • http://tckontrola.hr/files/freespinandcoin-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://tckontrola.hr/files/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://tckontrola.hr/files/how-to-make-clothes-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://tckontrola.hr/files/minecraft-tiktok-hacks_GM479516143.pdfIn PDF document text
    • https://tckontrola.hr/files/coin-master-free-spins-generator-no-human-verification_GM406889139.pdfIn PDF document text
    • https://tckontrola.hr/files/coin-master-heaven_GM406889139.pdfIn PDF document text
    • https://tckontrola.hr/files/free-minecraft-skins-ps4_GM479516143.pdfIn PDF document text
    • https://tckontrola.hr/files/unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • http://tckontrola.hr/files/blox-rewards_GM431946152.pdfIn PDF document text
    • http://tckontrola.hr/files/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdfIn PDF document text
    • https://tckontrola.hr/files/get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://tckontrola.hr/files/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A31 25288 bytes
SHA-256: 4fb78cc671dd17c35dbc54f92930d175228506f709e9a8bd3e0240449833b266
font_01_sfnt_off000084ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84CA 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EB5 18772 bytes
SHA-256: bc975d0cd3d1d09474d4302e54d359df6d5266f7e81f0636855fd998b44c4aca

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