Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6859c6f46a6a5e7…

MALICIOUS

PDF

51.3 KB Created: 2021-06-03 23:16:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: dbec933c0219ee5212cc0b33a8f6bff8 SHA-1: d0b36e9c88a4ab78b0d5ea670191e9bf63b40854 SHA-256: b6859c6f46a6a5e7f654395bf2bab7440c9b7142a2ec22a41a0ec8c3bf280727
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 0.9685

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 https://netcdn.online/app/431946152/free-roblox-accounts-with-robux-that-work-not-banned-game-hack PDF link annotation
    • http://www.perpusffup.or.id/repository/minecraft-menu_GM479516143.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/moonactive-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/free-spin-coin-master-app-download_GM406889139.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/coin-master-daily-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/coin-master-free-spins--coins-2021_GM406889139.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/how-much-robux-can-you-get-with-1-million-dollars_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/coin-master-daily-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/best-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/give-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/can-you-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/robux-hack-me_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/get-minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000531a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x531A 24664 bytes
SHA-256: 23e391379dfdb2d0042ed6c2cf9b5984cf45fb0b3d71e6a36a6a5e2a86bb7a52
font_01_sfnt_off00008ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AE5 3400 bytes
SHA-256: 75c3a8e6f5c68e0746f893c922e57fd7e888a21fb038f9ae3eedb0a197a59e24
font_02_sfnt_off00009604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9604 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_03_sfnt_off0000a2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA2AC 19248 bytes
SHA-256: efa3c9b2c8f55d2ce8a78f8ae751aa117ac14b1934403b15023fd1527a527783

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