Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b5e9c7a8d77acbe…

MALICIOUS

PDF

45.5 KB Created: 2021-05-11 06:22:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 450313ab0ce90dc07286f77a64c041fd SHA-1: afc6d321398a1c26754536360377f6343a8ac712 SHA-256: 9b5e9c7a8d77acbeac5f897b70cc1a63dea756a37681c6e8e3a053a6e73cb9cb
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of game hacks and free currency to trick users into clicking malicious links. It contains a large number of external links, many of which point to other PDFs hosted on similar domains, suggesting a link farm designed to distribute malware or phish for credentials. The primary malicious URL identified is https://netcdn.xyz/app/431946152/oprewards-com-robux-game-hack, which is likely a redirector to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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.xyz/app/431946152/oprewards-com-robux-game-hack PDF link annotation
    • http://mohacad.com/images/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://mohacad.com/images/como-hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://mohacad.com/images/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://mohacad.com/images/coin-master-online-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://mohacad.com/images/free-robux-discord_GM431946152.pdfIn PDF document text
    • http://mohacad.com/images/today-coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • http://mohacad.com/images/will-minecraft-dungeons-be-free_GM479516143.pdfIn PDF document text
    • http://mohacad.com/images/roblox-free-item-codes_GM431946152.pdfIn PDF document text
    • http://mohacad.com/images/coin-master-free-spins-2021-app_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/wwwcoin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • http://mohacad.com/images/coin-master-hack-pc-cheat-engine_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/coin-master-free-spins-today-new_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://mohacad.com/images/free-minecraft-server-hosting-with-plugins_GM479516143.pdfIn PDF document text
    • http://mohacad.com/images/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004885.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4885 25624 bytes
SHA-256: 8811d988044671fe163d15ff54790b646fa9549cd363c70b24031980f4c4bfa6
font_01_sfnt_off00008312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8312 2984 bytes
SHA-256: 889cfc2fd0afa9ea114d6666204c6ce0548d0aae2cba345827d317498c4c06bc
font_02_sfnt_off00008d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D3D 18852 bytes
SHA-256: cf2c3b83afe77c4831f4d7babd4a60d9ba9b4343e1e798506478eab5d5eea77b

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