Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8aeba9096600683…

MALICIOUS

PDF

43.0 KB Created: 2021-06-03 08:01:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 9ad25a66a2c8808c08ad285eb61a2865 SHA-1: fd45f9b820b333a1a036ec4b99ca5272beff36fa SHA-256: e8aeba9096600683f318702833edbba564b497dc81332b2a8b206031079a73fc
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document employs a fake CAPTCHA lure to trick users into clicking a malicious link, disguised as a "game hack" for Coin Master. The embedded link redirects to known malicious infrastructure. While no scripts were extracted, the document's structure and heuristics strongly indicate a phishing or social engineering attack aimed at driving traffic to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 https://netcdn.online/app/406889139/coin-master-20-free-spins-link-2021-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-links-to-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-spin-coin-master-app-download_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/master-coin-free-link_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-hack-mod-apk-android-1_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-minecraft-realms-to-join_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/claim-free-robux-button_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-army-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-free-clothes-girl_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-codes-2021-not-used_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_off00004fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FCD 23776 bytes
SHA-256: 1c06ac653a3cb0bb4626dcf80ad6c508d300e2b7ff048cd49251ece5f6ed05ae
font_01_sfnt_off000084b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84B6 18456 bytes
SHA-256: 35e9eef518be4f04511f9d5e633727e818c13db9b20db0c4aee16f9ae872e854

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