Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f556eab4a4f7441…

MALICIOUS

PDF

48.6 KB Created: 2021-06-03 22:51:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 743fbbc1912b40004b71bb42edba5d89 SHA-1: 06f2c1641f58e9a21522b5070ffc6f2206161771 SHA-256: 8f556eab4a4f7441044cf064c339d98f7d10cb3cff42f3b50bdd4b0389b3b5b5
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. 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 0.9871

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.online/app/431946152/hacks-para-roblox-game-hack.
  • 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 https://netcdn.online/app/431946152/hacks-para-roblox-game-hack PDF link annotation
    • https://library.kysm.edu.my/repository/pubg-uc-bc-com_GM1330123889.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/hacks-roblox_GM431946152.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/minecraft-gun-games-free_GM479516143.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/coin-master-daily-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/free-spins-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/coin-master-money-hack_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/coin-master-card-hack-app_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/coin-master-daily-spin-link_GM406889139.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/toolbox-for-minecraft-pe-mod-apk_GM479516143.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/adopt-me-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/coin-master-free-spins-link-today-ios_GM406889139.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/coin-master-download_GM406889139.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/tiktok-free-steam-games_GM835599320.pdfIn PDF document text
    • https://library.kysm.edu.my/repository/roblox-redeem-codes-free_GM431946152.pdfIn PDF document text
    • https://www.library.kysm.edu.my/repository/coin-master-spin-link-2021_GM406889139.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_004_off000052f9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52F9 33044 bytes
SHA-256: f6e0750c4e9cdc731e99b1d46a2457d502d67a770146740c7b61458337f49263
font_01_sfnt_off00009b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B8D 18336 bytes
SHA-256: 2c3591d0816fe2ec07885ff461cab1f1278707ef551a51e26631ad2b93349e2a

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