Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d828b28061056e8…

MALICIOUS

PDF

33.7 KB Created: 2021-07-04 04:30:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e8da804b65d1b8188060e831f7d872c6 SHA-1: 9e711e3a2ea8cb8e200af6c3c9c606d2de063f9a SHA-256: 5d828b28061056e8a8ccab59872671c4f9873ebf52d81abd6783f81a3b3c4817
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free game hacks and in-game currency to entice users. It contains multiple links to a malicious redirector infrastructure, specifically http://netcdn.tw/app/835599320/free-tiktok-followers-no-survey-game-hack, which is designed to lead users to potentially harmful content. The ML classifier strongly flagged this PDF as malicious, supporting the observed redirection behavior.

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/835599320/free-tiktok-followers-no-survey-game-hack In PDF document text
    • https://asiavisiontreks.com/userfiles/files/robux-cheat-engine-64_GM431946152.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/how-to-get-minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/roblox-hacker-2021_GM431946152.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/hack-roblox-robux-free_GM431946152.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/roblox-dominus-free_GM431946152.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/pubg-uc-kaise-khariden_GM1330123889.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/nuke-hack-roblox_GM431946152.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/hacks-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/tiktok-free-movie-website_GM835599320.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/how-to-get-free-minecraft-coins_GM479516143.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/roblox-phantom-forces-dll-hack-download-2021_GM431946152.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/roblox-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/real-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/roblox-free-hair-codes_GM431946152.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/free-robux-codes_GM431946152.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/minecraft-svg-images-free_GM479516143.pdfIn PDF document text
    • https://asiavisiontreks.com/userfiles/files/prison-life-roblox-hacks_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_off00002f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F6F 21984 bytes
SHA-256: d41aa108f2be3a2a29793cb77b7b2c524e202227b1f951c69244e5d7dbe7020b
font_01_sfnt_off00005fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD4 18644 bytes
SHA-256: 6edb8ad689b10d835f82dc03cb0a5fef2d21aed217b040173e83d84bb2f3bb80

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