Malicious PDF — malware analysis report

Static analysis result for SHA-256 30d8db75220efdd2…

MALICIOUS

PDF

46.0 KB Created: 2021-05-15 06:19:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9f9f102a7c05decca1cbb608ab310859 SHA-1: 5c8cdc8316346f9568f027b0af65851f3e74ccd0 SHA-256: 30d8db75220efdd24a1f7f35f82b4946ce67c081acf3b925ec809ef9c6a14977
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 0.9432

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/robux-generator-2021-game-hack PDF link annotation
    • http://knjiznica-oroslavje.hr/files/microsoft-store-robux_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/coin-master-free-spins-no-verification_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/coin-master-hack-uk_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/android-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/coin-master-cheat-to-get-free-spins_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/minecraft-launcher-free_GM479516143.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/earn-robux-today_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/coin-master-how-to-get-japan-sushi-card-free_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/coin-master-tiradas-gratis-link_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/roblox-2021_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/coin-master-hacks-no-human-verification_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/how-to-hack-roblox-accounts-2021_GM431946152.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_003_off00004677.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4677 25908 bytes
SHA-256: fda58c98bb334807c11068cae2d5aad313cb8f9b6f222256e40bb33a98c41520
font_01_sfnt_off000082fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82FD 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off0000900f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x900F 18584 bytes
SHA-256: 54c01f4636823bab04ead8b034b7e6a977e3ade15c99bbf56eda2a9f45b45d2e

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