Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cbb3e281f2b4c83…

MALICIOUS

PDF

35.1 KB Created: 2021-06-25 11:01:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: acb34dd8be03a29c0a199e3c4e72c2c0 SHA-1: 59202e1ffc330eed77b71fd00f4b04281c715903 SHA-256: 0cbb3e281f2b4c83ef63200e67eb2b55b941fe814b787f8765b2db0304d47286
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically advertising a 'game hack'. The document body and embedded URLs reinforce this, pointing to a lure for game-related cheats. The ML classifier also flagged this PDF with high confidence. The primary IOC is the malicious redirector URL.

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/cheat-roblox-jailbreak-glitches-game-hack In PDF document text
    • http://lib.untad.ac.id/repository/tiktok-like-bot-free_GM835599320.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-34-5-hack_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/hack-coin-master-app_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/coin-master-hack-mod-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/external-roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-console-robux-hack_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/best-tricks-co-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-village-3_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/archery-master-3d-coins-hack_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/cpbildco-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/how-to-get-free-spins-on-coin-master-2021-iphone_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-minecraft-mods-for-ps4_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-roblox-svg_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/inr-to-uc-pubg_GM1330123889.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/hacks-para-roblox-agosto-2021_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-hack-mad-merder-2-game_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_off0000303e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x303E 22936 bytes
SHA-256: 6f2999b0cf25aa2e1561e0495e3b1c070528a8bda862b2d0b368450856d8b24f
font_01_sfnt_off000063a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63A4 19212 bytes
SHA-256: 428fbf16222e147215e79969f59e0abd872a53641b96460924355323fb9614d0

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