Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5ce75e93c0ac7f1…

MALICIOUS

PDF

33.8 KB Created: 2021-07-03 13:19:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 5ca2e026eb91b45e975464a155f0b39c SHA-1: 420afbabe5547c58d21543947679f5dba883cb47 SHA-256: e5ce75e93c0ac7f1b23c6ed5c09cdd45128ee18aa0a2bfaa878adabfebac2350
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to known malicious redirectors, masquerading as game hacks and free account generators. The primary lure URL is http://netcdn.tw/app/479516143/free-minecraft-premium-account-game-hack. The document body and heuristics indicate a social engineering tactic to trick users into clicking these links, likely leading to further malware downloads or phishing pages. No scripts were extracted, but the presence of malicious links and the ML classifier output strongly suggest malicious intent.

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.tw/app/479516143/free-minecraft-premium-account-game-hack In PDF document text
    • http://library.acehresearch.org/repository/robux-hack-script-in-inspect-code_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-com-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-accounts-for-sale-free_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-get-free-pets-on-pet-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/minecraft-free-download-windows_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-hack-roblox-hospital-roleplay_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/cheat-codes-vehicle-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/tix-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-2-player-tycoon-cheat-codes_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-hack-download-no-survey-2021_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-spin-and-coin-link-app_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-cheat-in-roblox-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-got-talent-hack_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-se-puede-hackear_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/asshat-level-7-roblox-hack_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_off00003093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3093 21884 bytes
SHA-256: ee5fc3e3f1d6deac185a5627180042956609ff7f37fdf9c2a9b4bea9d0e7d1f1
font_01_sfnt_off000060b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60B6 18552 bytes
SHA-256: 335ad5bd11d1b5490beeffd4b04e426b92c3c8588cbb26eb3dbcf918d515cd86

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