Malicious PDF — malware analysis report

Static analysis result for SHA-256 6229b1b63a02e976…

MALICIOUS

PDF

51.2 KB Created: 2021-06-03 08:55:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6175444ec72bf53914137b91307c05b0 SHA-1: 1c87a142efd18813ead36d6799bf17b18b4cb93e SHA-256: 6229b1b63a02e976a57b3d8512bc696da70987a5bb450ba2d66cec2b7f8536df
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 0.9849

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/431946152/free-roblox-accounts-with-robux-that-work-not-banned-game-hack PDF link annotation
    • https://www.apartmani-mestrovic-krk.hr/files/coin-master-hack-version-2021-download_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/minecraft-survival-free_GM479516143.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/free-roblox_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/roblox-free-hair-codes_GM431946152.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/coin-master-hack-2021-android_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/how-to-get-unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/hackear-coin-master-espaol_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/coin-master-fun-hack-online_GM406889139.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/martian-lettuce-coin-master-free_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/app-master_GM406889139.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/coin-master-hacks-to-get-spins_GM406889139.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/minecraft-wurst-hacked-client_GM479516143.pdfIn PDF document text
    • http://apartmani-mestrovic-krk.hr/files/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • https://www.apartmani-mestrovic-krk.hr/files/roblox-jailbreak-hack-download_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050ed.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50ED 36432 bytes
SHA-256: c1b86d1706b2e424fe9856ce98227000d740f3794c0206e0ffc7319e000de6b0
font_01_sfnt_off0000a358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA358 19248 bytes
SHA-256: efa3c9b2c8f55d2ce8a78f8ae751aa117ac14b1934403b15023fd1527a527783

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