Malicious PDF — malware analysis report

Static analysis result for SHA-256 6023cdf3d3c0510d…

MALICIOUS

PDF

35.0 KB Created: 2021-06-20 03:15:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f5f79d985fc4ecd66cb3ff92bb7b6fd6 SHA-1: 0ce61880f8556510d528b4d5b8170eb48cdea5ea SHA-256: 6023cdf3d3c0510d9aa8f1e246a66dd8285bb919c8c80f3ec7472b21053e1c01
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a prominent link disguised as a 'free generator / game hack' for Roblox, which is a known lure for scams and malware. The ML classifier strongly flagged this PDF as malicious. The embedded URL, http://netcdn.co/app/431946152/free-roblox-accounts-2021-obc-game-hack, is identified as a malicious redirector, likely serving as the initial stage for delivering a secondary payload.

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/free-roblox-accounts-2021-obc-game-hack In PDF document text
    • http://library.apsidoarjo.ac.id/repository/roblox-lumber-tycoon-2-grief-hack_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/free-vip-accounts-roblox_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/coin-master-free-food_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/how-to-get-free-spins-on-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/today-on-roblox-we-will-be-hacking-scootch202156_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/apocalypse-rising-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/hack-coin-master-1_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/free-robux-obby_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id//repository/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/roblox-scr-hack_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/roblox-free-hair-promo-codes_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/best-free-spins-link-coin-master_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/roblox-games-with-free-vip-servers_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/coin-master-free-spin-and-coin-link-today_GM406889139.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/free-robux-apk-ios_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/free-robux-generator-roblox-game_GM431946152.pdfIn PDF document text
    • http://library.apsidoarjo.ac.id/repository/can-i-have-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_off0000302b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x302B 22636 bytes
SHA-256: cfd4abd29d5ccfe6ce1854b372861f83bc70c4093843228d5fd26ee3272d04b5
font_01_sfnt_off000062e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62E9 19296 bytes
SHA-256: 0c34f4f773541867398f86c30310e6ac647c9a82f77ce7107275bcdae60cc1c8

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