Malicious PDF — malware analysis report

Static analysis result for SHA-256 b839ba70cad3e6c6…

MALICIOUS

PDF

44.7 KB Created: 2021-06-03 14:35:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f6f4352069ac1eb25ff90d2fcc778c0d SHA-1: def8c3a91f32991b8860cdf6b31c6e88d26ed81b SHA-256: b839ba70cad3e6c6d582c91afb40d62398fcd8fea75d8f6b8f1654cbfb0e2199
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses an MFA/2FA-themed lure and a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm, 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 7

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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/431946152/roblox-pink-free-robux-game-hack PDF link annotation
    • http://library.ulb.ac.id/repository/free-coins-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-roblox-usernames-and-passwords_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-daily-free-spins-link-today-blog_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/haktuts-2021-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-hack-download-apk_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/hacker-minecraft-song_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-do-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-pet-food-free_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-70-spin-link_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/corn-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-website_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-levels_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/100-hack-coin-master_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
font_00_sfnt_off0000500c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x500C 26036 bytes
SHA-256: 9e3517a456dce9cc48aebcb6f45f73a9cc9c606f291fef7019428d956688a10a
font_01_sfnt_off00008b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B7C 18532 bytes
SHA-256: 62e9169d40109a3abf4bdf842601a34c83c90693a7fee2a3f682a11a81f7ba3a

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