Malicious PDF — malware analysis report

Static analysis result for SHA-256 b75ed320afac64cd…

MALICIOUS

PDF

34.5 KB Created: 2021-06-20 12:44:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d964d2da4d4f5d6a68890a7263ccf2fc SHA-1: 15821905587d1132c7457ad2a74dbe2f0feabe43 SHA-256: b75ed320afac64cd9516eb773ccb689ad9a6cc50fd4bc66138d1c6f217442e21
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. It uses a password-protected-archive 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 0.9980

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://netcdn.co/app/431946152/exploits-for-roblox-cheats-game-hack PDF link annotation
    • http://library.futureuniversity.com/repository/create-minecraft-server-free_GM479516143.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/wurst-hacked-client_GM479516143.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-robux-counter-for-roblox_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/roblox-black-sleeves-free_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/minecraft-modded-client_GM479516143.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-minecraft-java-server_GM479516143.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/roblox-free-executor_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/roblox-password-hacker_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-roblox-promo-codes-march-21_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/master-free-spin_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/best-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/roblox-its-free_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
font_00_sfnt_off0000313c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x313C 21816 bytes
SHA-256: e70cd87eaa0a1bfa4bbd539bcbae79da8bf7447c0e6de844dbd4dce8dfb42bcc
font_01_sfnt_off00006151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6151 19216 bytes
SHA-256: 366e47eb96242549430d08302c3b60770d7ead8b3bf10503d74ebc0dbc3d4c1d

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