Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff1cbccb14e0a0a…

MALICIOUS

PDF

35.2 KB Created: 2021-07-06 01:34:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 2ecd1be5ca61bdfcf70c212117461640 SHA-1: 0998faf0394ead2cbfd353f9efdd123acdc8e0bc SHA-256: 3ff1cbccb14e0a0acf037fe47bd4b5da81f508aad350f125d8eba55e6a007c75
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting game hacks and free spins. The primary link, http://netcdn.tw/app/406889139/real-coin-master-free-spins-game-hack, is flagged as a known malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering tactic to drive users to potentially malicious websites, likely for credential harvesting or further malware delivery.

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/406889139/real-coin-master-free-spins-game-hack In PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/roblox-case-clicker-rap-hack_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/free-robux-wiz_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/pubg-uc-qiymetleri_GM1330123889.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/www-free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/free-robux-flame_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/www-cheatsk-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/coin-master-free-spins-8-14-2021_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/how-to-get-free-robux-no-waiting-instant_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/getrobux-now_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/coin-master-free-spins-2-5-2021_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/who-tiktok-free-followers_GM835599320.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/minecraft-free-download-chromebook_GM479516143.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/need-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/code-free-robux_GM431946152.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/mcpe_GM479516143.pdfIn PDF document text
    • https://www.simplenepaltravel.com/userfiles/files/free-coins-app-for-coin-master_GM406889139.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_off000031d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31D3 23520 bytes
SHA-256: 1e1c5d40f64439b8b475fd158f7fa979edebf98aca8011258074a0504023c161
font_01_sfnt_off00006716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6716 18248 bytes
SHA-256: ddd8e791914f95ee13f9dec6f95a8982112c815e258aad2e69701e338f1614a0

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