Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c9f4a79dbe3b582…

MALICIOUS

PDF

34.2 KB Created: 2021-06-18 01:25:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a07ac2038125f8797d88baa4cd703efa SHA-1: b24f99470be3db8d98842857e377f6e00c1bacaf SHA-256: 7c9f4a79dbe3b5828210d1f45c870f79f9b4c51634b3ebf77ecaad41f4cd2f7e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirector infrastructure, specifically advertising 'free generators' and 'game hacks' for popular games like Roblox and Coin Master. The primary lure URL is http://netcdn.co/app/431946152/roblox-how-to-get-free-robux-obby-game-hack. While no scripts were extracted, the document's structure and embedded URLs strongly indicate a phishing or scam attempt designed to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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-how-to-get-free-robux-obby-game-hack In PDF document text
    • http://library.itekes-bali.ac.id/repository/free-roblox-auto-farm_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-draw-roblox_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-hack-without-root_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-minecraft-addons_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-redcat_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-assasin-hack-script-2021-unpacthed_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/100-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-cheat-at-boku-no-roblox-remastered_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/minecraft-hacks-pc_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-hack-tool-without-human-verification_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/cm-spin-link_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-roblox-level-scripts_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/flame-gg-free-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_off00002d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D62 22588 bytes
SHA-256: 1582c7c8634c237522f0911a129dec96dc8f55e76325d175809d58f068bfad1d
font_01_sfnt_off00005fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FBF 19240 bytes
SHA-256: e4960838b60c34afc7f8d881c1b2a88f900f7a205b7cf973101ccb1fa6abab98

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