Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cc4fce985c5e2ff…

MALICIOUS

PDF

35.8 KB Created: 2021-07-03 17:15:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 5adcdd6d93beced83da34d633ca5d8fd SHA-1: dc55c865633f15bf837018192f46e5870550a887 SHA-256: 1cc4fce985c5e2ffb7afdde71715af8fed5ec3f80a876b4af6209db044e35c07
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to malicious redirectors, specifically promoting 'game hacks' and 'generators' for popular games like Coin Master and Roblox. The ML classifier strongly flagged this PDF as malicious, and the presence of a download button lure and callback phishing elements further support a malicious intent. The primary URL, http://netcdn.tw/app/406889139/open-coin-master-game-hack, is identified as a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/open-coin-master-game-hack In PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/free-robux-master_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/free-robux-generator-codes_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/robux-cheats-no-download_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/roblox-noclip-hack-2021-cheat-engiene_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/coinmaster-com_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/coin-master-official-page_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/free-robux-descargar_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/games-in-roblox-that-give-you-free-stuff_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/play-coin-master-online-free_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/free-robux-only-username_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/how-to-gain-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/roblox-free-faces-catalog_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/coin-master-gold-cards-free-link_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/free-tiktok-fans-and-likes_GM835599320.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/tiktok-minecraft-hacks_GM479516143.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
stream_002_off000035fc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x35FC 23072 bytes
SHA-256: 7b1fe7b4ef74c680adbf39da621931c64ddb6993004d8a67ede79d1201f4ebdc
font_01_sfnt_off00006a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A02 18008 bytes
SHA-256: 01b2d26e5667a3b5a50f75626f975bd6982cd8afb945009ae254d5a27d36e96c

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