Malicious PDF — malware analysis report

Static analysis result for SHA-256 db0a2f306fa2f931…

MALICIOUS

PDF

34.2 KB Created: 2021-07-04 06:49:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 086aed4ced23b82ecc1bfb3720871918 SHA-1: aa1ae43c0bee65f22a62eb34f58884ffb7f515e3 SHA-256: db0a2f306fa2f931ed6f3568dd06e791e660c90bc8f704eabb6d5df891f223fc
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 0.9980

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.
  • 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 http://netcdn.tw/app/479516143/how-to-downgrade-minecraft-pe-game-hack PDF link annotation
    • https://new-era.com.tw/image/data/files/free-minecraft-maps-pe_GM479516143.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/free-spins-coin-master-twitter_GM406889139.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/coin-master-promo-code-2021_GM406889139.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/make-robux_GM431946152.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/free-roblox-birthday-invitation-templates_GM431946152.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/free-roblox-generator_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/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/roblox-hack-kick-gui-2021-work-in-other-game_GM431946152.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/coin-master-free-spins-link-iphone_GM406889139.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/free-roblox-acc_GM431946152.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/free-robux-2021-november_GM431946152.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/is-roblox-studio-free_GM431946152.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/how-to-get-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/how-to-hack-billionaire-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/how-to-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/minecraft-alt-accounts-free_GM479516143.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_off00002f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F99 22828 bytes
SHA-256: 9296f7f473477d4be41885289fd21f7e190d1aebfc2ac481abd57601b1b6124c
font_01_sfnt_off0000620c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x620C 18656 bytes
SHA-256: f671632c41bdcd8896512b89e0179723263a2bce0274879a7730ace5e1a9329c

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