Malicious PDF — malware analysis report

Static analysis result for SHA-256 57913c7e4662730f…

MALICIOUS

PDF

43.7 KB Created: 2021-06-03 05:29:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 58c12b66313ddfd4b2bd34fdcf30ef1d SHA-1: ddb9d68cbcb8b1e082224712bb4aadfa077e0c64 SHA-256: 57913c7e4662730f976afdc9ff211e5e871bbec5bd59ee9eca4c52293725ed10
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 0.9865

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/406889139/free-spins-and-coins-blogspot-coin-master-game-hack PDF link annotation
    • https://new-era.com.tw/image/data/files/how-many-levels-are-in-coin-master_GM406889139.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/coin-master-hack-tool-download_GM406889139.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/how-to-get-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/minecraft-survival-hacks_GM479516143.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/coin-master-free-spins-link-2021-iphone_GM406889139.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/old-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/coin-master-hack-apk-app_GM406889139.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/robux-gainer_GM431946152.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/hack-coin-master-without-root_GM406889139.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/pro-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/free-online-minecraft-server_GM479516143.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/minecraft-free-download-ipad_GM479516143.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/coin-master-free-spins-fb-champion_GM406889139.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/free-roblox-svg_GM431946152.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/coin-master-apk-hack-2021-ios_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_004_off00004ed7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ED7 24504 bytes
SHA-256: ea5896e1168b48746cbcf0a3e679037efc75aef5d9632081d264cef21cf27c6c
font_01_sfnt_off00008722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8722 18636 bytes
SHA-256: f050b99fae15787f3dcd3a9ca1a9f1ede4f92304234d1532a9c4a0f9b5d220ed

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