Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f387ab41164b200…

MALICIOUS

PDF

33.2 KB Created: 2021-07-08 09:01:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d112ccabb68b14886f04b0ed770a19a7 SHA-1: d5ef3f08345d2eccd8589801b139077e9ae84478 SHA-256: 8f387ab41164b2007797cacb2869c72af28bc0df26ceb4285ee02a9600a01665
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/479516143/free-minecraft-survival-server-game-hack PDF link annotation
    • https://esl.hess.com.tw/image/data/files/80-robux-free_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/free-robux-no-download_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/roblox-hack-no-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/coin-master-spin-hack-link_GM406889139.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/hack-roblox-void_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/coin-master-hack-root_GM406889139.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/cheat-engine-roblox-scripts_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/coin-master-free-stuff-links_GM406889139.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/roblox-cheat-table-online_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/free-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/robux-boost_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/coin-master-35-2-hack_GM406889139.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/how-to-make-a-minecraft-server-for-free-java_GM479516143.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/cheats-to-get-roblox-money_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/guy-goes-to-jail-for-hacking-roblox_GM431946152.pdfIn PDF document text
    • https://esl.hess.com.tw/image/data/files/free-robuxgg-hack_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_off00002f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F04 21964 bytes
SHA-256: 616584bbff245ad0e22edd0e3b9102abb4e63a9206aa97214690399f80bbb6c1
font_01_sfnt_off00005f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F59 18184 bytes
SHA-256: aa4b263e48621cfecba3d9fc0f6d5ba7bc8503c5f36487cc72bd4c38d51a6610

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