Malicious PDF — malware analysis report

Static analysis result for SHA-256 165e6d28b931c145…

MALICIOUS

PDF

44.6 KB Created: 2021-05-14 10:15:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 8fc5e65b488c1146aaf3cf73362b7d86 SHA-1: ca5cd7201758dd89aaf275aeb66d90f97d965f74 SHA-256: 165e6d28b931c1452bfce92d1fd10352a2c53e6103f53df1fab0e0eb7503be78
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 0.9632

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/how-to-get-free-coins-on-coin-master-hack-game-hack PDF link annotation
    • http://onlinemusicsolutions.com.au/images/free-spin-gratis-coin-master_GM406889139.pdfIn PDF document text
    • http://onlinemusicsolutions.com.au/images/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://onlinemusicsolutions.com.au/images/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
    • http://onlinemusicsolutions.com.au/images/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://onlinemusicsolutions.com.au/images/coin-master-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • http://onlinemusicsolutions.com.au/images/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://onlinemusicsolutions.com.au/images/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://onlinemusicsolutions.com.au/images/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • http://onlinemusicsolutions.com.au/images/free-minecraft-shaders_GM479516143.pdfIn PDF document text
    • http://onlinemusicsolutions.com.au/images/free-robux-earn_GM431946152.pdfIn PDF document text
    • http://onlinemusicsolutions.com.au/images/free-coins--spins-coin-master_GM406889139.pdfIn PDF document text
    • http://onlinemusicsolutions.com.au/images/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://onlinemusicsolutions.com.au/images/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://onlinemusicsolutions.com.au/images/coin-master-free-coin-and-spin-app_GM406889139.pdfIn PDF document text
    • http://onlinemusicsolutions.com.au/images/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://onlinemusicsolutions.com.au/images/minecraft-free-apk-java-edition_GM479516143.pdfIn PDF document text
    • http://onlinemusicsolutions.com.au/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://onlinemusicsolutions.com.au/images/free-roblox-characters_GM431946152.pdfIn PDF document text
    • http://onlinemusicsolutions.com.au/images/spin-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://onlinemusicsolutions.com.au/images/get-minecraft-windows-10-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_003_off00004a04.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A04 24504 bytes
SHA-256: 1044c6f4d4497c6619e964700e2ad7278b53a6653693900b92315cfec02759ed
font_01_sfnt_off00008261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8261 2920 bytes
SHA-256: 601c50867a41b9362538ff18e5f9479a0f9badf698aaf1eb7e88469c11719db7
font_02_sfnt_off00008c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C7B 18044 bytes
SHA-256: 8c08c70171ded8116d72ec6b9f41602b425c47027f7aa83ef766cc7ef1375634

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