Malicious PDF — malware analysis report

Static analysis result for SHA-256 a82a7a4d3353e017…

MALICIOUS

PDF

34.9 KB Created: 2021-07-08 21:48:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 822a865658e956ab218eb3b8fe63b5d1 SHA-1: d17cd4f216bce7aaca6916d54ba8dbf3c7e80ff2 SHA-256: a82a7a4d3353e0177086e3feb7e9721e04829c954d46d6c4a07eee23d5d78ac9
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/406889139/20-free-spin-link-coin-master-game-hack PDF link annotation
    • https://dentmate.com.tw/image/data/files/robux-free-com_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/how-to-get-free-robux-2021-new_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/roblox-free-body_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/roblox-free-money-hack_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/grabpoints-robux_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-robux-download_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/money-cheats-sims-jailbreak-roblox_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-script-executor-roblox_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/cheat-indetectable-roblox-fantome_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-spins-coin-master-legit_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/coin-master-daily-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/how-to-get-free-robux-on-computer-fast-2021_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/coin-master-cheat-codes-free_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-online-generator-for-coin-master_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-minecraft-skins-pc_GM479516143.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/roblox-mask-free_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_off000030d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30D4 22944 bytes
SHA-256: 32cc3699a329fed99aac6cf2cfd7ad87158ede089ee15aeb76df80f54349008f
font_01_sfnt_off00006477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6477 18640 bytes
SHA-256: 1e3f3b3c18bd14673104f6b6dd19f58d422a9a34ae0bbf2597c81585bf1c1911

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