Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f75f6be41ac2a7f…

MALICIOUS

PDF

34.3 KB Created: 2021-07-06 10:05:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 724c1b005562a036ee85798b2bd4058b SHA-1: e3964e02e4461ead16102265e0a28fa0bef7f045 SHA-256: 9f75f6be41ac2a7f294b9547d89a2f4d81680f5c6f13bf101d0e705a10e081f8
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/free-coin-master-cheats-game-hack PDF link annotation
    • https://cnc-xinrong.com.tw/image/data/files/roblox-final-stand-2-cheat_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/master-free-spin_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/roblox-promo-codes-2021-robux_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-roblox-followers-generator_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/card-hack-in-coin-master_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-free-spins-2021-haktuts_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/earn-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/cbro-roblox-funds-hacks_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-robux-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/pubg-uc-770_GM1330123889.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/daily-coin-master_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/hacking-apps-for-roblox_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/moonactive-free-spins_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/cheat-codes-for-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/how-to-add-mods-to-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-robux-earn_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/robux-hack-proven_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
stream_002_off00002fef.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FEF 23036 bytes
SHA-256: 9d5a16d86b98f0c152366dc4246dc88d12ad96602d77f2d5f18d16e6b96e63a7
font_01_sfnt_off000063e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63E1 18164 bytes
SHA-256: 4e327774ea367dd6db8ab9fb2ead9e727b5b85cd8073dc852ad5e8a680729fc1

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