Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b4a025a63f541e…

MALICIOUS

PDF

34.9 KB Created: 2021-07-09 19:12:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: a3ce374dc03eb1e756fc62397bc29baa SHA-1: 48d1d2bc8fb08088142d5402536f66a51991a549 SHA-256: 81b4a025a63f541e4f5c887b41e81df6f39426588b9787eb63c0dec45b224b38
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a LOLBin command-execution lure. 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 5

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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/how-to-get-minecraft-for-free-on-your-phone-game-hack PDF link annotation
    • https://creationegyptco.com/userfiles/files/get-free-robux-gg_GM431946152.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/is-roblox-free-on-xbox-1_GM431946152.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/roblox-booga-booga-hack_GM431946152.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/coin-master-mod-apk-latest-version-free-download_GM406889139.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/play-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/free-spins-for-coin-master-on-1-19-19_GM406889139.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/how-to-hack-roblox-with-cmd-prompt_GM431946152.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/is-minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/can-you-get-free-tiktok-followers_GM835599320.pdfIn macro / runtime command snippet
    • https://creationegyptco.com/userfiles/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/roblox-script-hack_GM431946152.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/free-spins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/card-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/get-free-robux-easiest-way_GM431946152.pdfIn PDF document text
    • https://creationegyptco.com/userfIn macro / runtime command snippet
    • 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_off000033e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33E2 22152 bytes
SHA-256: 8f13f9b0af2643a849af2aaef774fee65bf90943446fc364ad9b3125f5c4f3fb
font_01_sfnt_off0000649d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x649D 18784 bytes
SHA-256: ab0cf905dc5988e311e4929c945d58dbde5e393d70311552a9ff538161641e37

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