Malicious PDF — malware analysis report

Static analysis result for SHA-256 f97b4a488667a2c8…

MALICIOUS

PDF

35.4 KB Created: 2021-07-09 00:50:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 1712974b04db8c865bfdfa94ff25032e SHA-1: 095bb2ce3b53184c241007eb872cc9298346d7d9 SHA-256: f97b4a488667a2c8435c1be036149c17f95b72b124c4f9f5e21177891751e196
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains links to a known malicious redirector infrastructure, specifically advertising game hacks and generators. The primary lure is the URL http://netcdn.tw/app/406889139/coin-master-hack-apk-july-2021-game-hack, which is designed to trick users into downloading potentially unwanted or malicious software. The ML classifier strongly supports the malicious nature of this PDF.

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-hack-apk-july-2021-game-hack In PDF document text
    • https://cleansui.com.tw/image/data/files/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/free-promo-codes-roblox-body_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/free-roblox-game-card-codes-25_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/free-roblox-girl-clothes_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-heaven-daily-free-spins-and-coins-links_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/roblox-lumber-tycoon-two-hack_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/free-spins-coin-master-2021-glitch_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/add-robux_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/fastbucks-free-robux_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/dantdm-free-robux_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/free-card-roblox_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/minecraft-xbox-one-code-free_GM479516143.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/free-spin-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/free-custom-minecraft-skins_GM479516143.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/coin-master-daily-spin-link-app_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-spin-link_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/mcpe-116_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000033b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33B1 22220 bytes
SHA-256: 074c9655ce34970350b77332e8c3104ac6ec8d0cafdd664519d5678a59af19dc
font_01_sfnt_off00006507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6507 19140 bytes
SHA-256: be5c43c74bc19b4a02d5512ddc471c16ecd3e0fd6fcc29a5737e08cb61c294c7

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