Malicious PDF — malware analysis report

Static analysis result for SHA-256 95ef8bd86eb15c90…

MALICIOUS

PDF

34.3 KB Created: 2021-06-25 16:45:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 0c4a161b31f82e231a5ce183d3c8b4a2 SHA-1: 36857d343323deaa92708728c1464254b03c0fc1 SHA-256: 95ef8bd86eb15c904b4f6628b245ea45ca531bfb3c5f6685dcf51ad2497acc16
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a lure related to 'game hacks' and presents a fake CAPTCHA to trick users into interacting with a malicious link. This link redirects to known malicious infrastructure, indicating a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious.

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.
  • 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 http://netcdn.co/app/431946152/how-to-pretend-to-hack-in-roblox-game-hack In PDF document text
    • https://www.toyogas.com.tw/upload/files/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/rbx-free-robux_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/how-to-get-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/coin-master-levels_GM406889139.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/minecraft-free-download-pc_GM479516143.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/coin-master-free-coins-today_GM406889139.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/coin-master-hack-free-spins_GM406889139.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/just-go-to-mobi-hack-robloxhack_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/free-roblox-usernames-and-passwords_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/comment-telecharger-un-logiciel-de-hack-dur-roblox_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/redeem-code-roblox-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/roblox-hack-mod-menu-download_GM431946152.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/how-to-use-redstone_GM479516143.pdfIn PDF document text
    • https://www.toyogas.com.tw/upload/files/free-spins-coin-master-2021-app_GM406889139.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_off00003154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3154 21468 bytes
SHA-256: 97ca452d4a64577e3bb79879c2bc96dcda2cabd6803fe7402037edfeefad64ba
font_01_sfnt_off00006052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6052 19252 bytes
SHA-256: f7e83e0205296f574af3d170663531cf4d10febc5fd6b2729f9f681bee197f83

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