Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aae95a69a633248…

MALICIOUS

PDF

41.4 KB Created: 2021-05-13 20:11:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 444a8cfb9af2ca5cd055f34cab8ffe7c SHA-1: 51f4dc2875b53fce7a9532d3b4f9f714e6b590e7 SHA-256: 8aae95a69a633248c32d0b3be7812dc5dcf7fabaccd8dc9e1d58df75b5999c93
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 0.9971

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/406889139/coin-master-hack-pc-free-game-hack PDF link annotation
    • http://foo.com.tw/files/robuxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/www-robux-us_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-hack-without-downloading-apps_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-get-minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-minecraft-videos_GM479516143.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/hack-coin-master-apk-32_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-get-free-clothes-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-make-roblox-clothes-for-free_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-get-more-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-hack-ios-jailbreak_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-free-spins-and-coins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/free-spins-coin-master-cheats_GM406889139.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_003_off000047d4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47D4 24652 bytes
SHA-256: 00c01c27d41ea27ce22940f62596958015afc25d846b0f6c7932d01c1fe8999e
font_01_sfnt_off00008070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8070 18036 bytes
SHA-256: d1e417f8400c4227caca57c80f12745841979f8062967c06e5a64cb2220bf511

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