Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f23f2dfcefa5c4…

MALICIOUS

PDF

33.5 KB Created: 2021-06-26 18:12:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4058fbd01ca6d8485f0430c6a3012032 SHA-1: 58f70513798d23b4859da4c3b463d16ec4b9f5c3 SHA-256: c3f23f2dfcefa5c4272aa8936873546d91c41392db0368af06e02fc14c730a22
142 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. 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 0.9980

Heuristics 5

  • 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.
  • 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/roblox-hack-pro-game-hack PDF link annotation
    • https://loba.com.vn/public/upload/files/how-to-legally-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-hack-apk-with-fb-login-2021_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/roblox-the-guy-who-hacked-the-admin-panel_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/roblox-the-rake-admin-hacks_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/how-to-get-minecraft-windows-10-for-free-with-java_GM479516143.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/how-to-remove-default-clothing-for-free-roblox_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/a-hacker-is-threatening-me-roblox_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/sex-cheat-codes-roblox-sound-id_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/roblox-free-accounts-pastebin_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/robux-codes_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-tiktok-followers-app_GM835599320.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/minecraft-bedrock-free-with-java_GM479516143.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-kid-games-online-roblox_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-hack-cheat-generator-coins-and-spins-unlimited_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/how-to-use-cheat-engine-64-on-roblox-for-robux_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_off00002e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E62 21880 bytes
SHA-256: c4ac9fbf11607bd2c1d15083f781599c781aa1745e309dd6185866cf09f6c5f0
font_01_sfnt_off00005e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E8F 18808 bytes
SHA-256: 5e86d849f3a84577bd41c583dba256e4d53235dc27a798055f32184413baf39d