Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6a6bdd12d920648…

MALICIOUS

PDF

34.5 KB Created: 2021-07-04 03:16:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: aabaec18ea8d6130a8c6aed67648ac2a SHA-1: de9da905c509f8d2c674fdf8994ba498ed20abb1 SHA-256: d6a6bdd12d9206483aab4bd1b1e9d1672cb2a13e3739bdd4273e2f85e783cff0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, masquerading as game hacks and generators. The primary lure URL is http://netcdn.tw/app/406889139/hack-coin-master-free-game-hack, which is part of a network of redirectors pointing to various game-related cheat pages. The document's structure and embedded URLs strongly suggest a phishing or scam campaign designed to lead users to potentially harmful content or further malware downloads.

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/hack-coin-master-free-game-hack In PDF document text
    • http://cleansui.com.tw/image/data/files/how-to-hack-roblox-speed-using-ccv3_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/cheat-roblox-lumber-tycoon-2-engine_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/fart-attack-roblox-hack_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/how-to-hack-roblox-boys-and-girls-hangout_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/free-account-generator-roblox-with-robux_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/coin-master-hack-2021-free_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/free-roblox-girl-clothes_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/roblox-assassin-cheats_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/roblox-arcane-adventures-hack-2021_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/roblox-free-gui-op_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/how-to-get-free-faces-with-no-robux-works_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/unlimited-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/coin-master-2021_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/coin-master-twitter-free-spins_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/coin-master-jackpot-madness-hack_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/free-minecraft-alt-accounts_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
font_00_sfnt_off000031c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31C7 22720 bytes
SHA-256: 4d2b2496a4a4fca143b9bc4590c1ccb4bf186d2557510d65ae8f56eac3f0fec8
font_01_sfnt_off0000646c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x646C 18168 bytes
SHA-256: be72a1914a99b846651b156c672e0768d1f742f579973333786d0ab12deac364

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