Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a180350496bcc3a…

MALICIOUS

PDF

35.0 KB Created: 2021-07-10 00:57:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 61942d8e80214d1b7569d8a91d9ea99a SHA-1: 4ee2d6542b0eff108a06411096cab7dfcbf06cb9 SHA-256: 3a180350496bcc3ad9ef437a469390e4f18f8e2e1c8b85627070c6afea64cd87
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generators' and 'game hacks' for popular games. The primary redirector URL identified is http://netcdn.tw/app/406889139/coin-master-free-link-2021-game-hack. This indicates a phishing or scam attempt designed to lure users to potentially harmful websites. No scripts were extracted, but the document structure and embedded links strongly suggest a social engineering attack.

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/coin-master-free-link-2021-game-hack In PDF document text
    • https://www.tdbaska.hr/files/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/best-free-minecraft-server-hosting-reddit_GM479516143.pdfIn PDF document text
    • http://www.tdbaska.hr/files/how-to-get-free-robux-july-2021_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/download-roblox-hack-for-pc_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/cpbildco-robux_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/completed-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.tdbaska.hr/files/minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • https://www.tdbaska.hr/files/how-to-get-free-likes-on-tiktok_GM835599320.pdfIn PDF document text
    • http://www.tdbaska.hr/files/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.tdbaska.hr/files/a-hack-to-open-the-applications-on-roblox-got-talent_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/hach-for-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/como-hackear-el-juego-coin-master_GM406889139.pdfIn PDF document text
    • https://www.tdbaska.hr/files/roblox-free-vip-server_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • http://www.tdbaska.hr/files/oprewards-com-robux_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/coin-master-daily-bonus_GM406889139.pdfIn PDF document text
    • https://www.tdbaska.hr/files/free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.tdbaska.hr/files/free-robux-no-human-verification-or-survey-or-download-2021_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_off000031cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31CF 22780 bytes
SHA-256: 333197f747a790b28f3dd1d3908eef13a6a75346bca2b587ec8b44172cb332c0
font_01_sfnt_off00006500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6500 18568 bytes
SHA-256: 5c6f2b8c8950227f34c0c7c762a0319831c5dcbb819f0110f1dbfe9ff8d1e338

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