Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f4a5dcfd109fad…

MALICIOUS

PDF

35.1 KB Created: 2021-06-18 05:41:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 93cdd9a44a0715b9fd594276f2dc82a8 SHA-1: 193ea588cb5f34c4231c2297bceecd419c06cd36 SHA-256: 71f4a5dcfd109fad6b4ee977d247d855e435d513b4856550c46401a3e5801885
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure related to 'free game hacks' and 'free robux', directing users to a suspicious URL. This indicates a phishing or scam attempt designed to trick users into visiting a potentially malicious website. The ML classifier strongly flagged this PDF as malicious, supporting the phishing lure.

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.
  • 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: http://netcdn.co/app/431946152/roblox-sell-t-shirt-for-free-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 http://netcdn.co/app/431946152/roblox-sell-t-shirt-for-free-game-hack PDF link annotation
    • https://pengacara-nbp.com/ckfinder/userfiles/files/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/gaming-dunia-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/find-hacked-roblox-account-back_GM431946152.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/lots-of-robux_GM431946152.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/tiktok-free-likes-and-followers-2021_GM835599320.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/minecraft-download-free-download_GM479516143.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/free-minecraft-skins-xbox-one_GM479516143.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/coin-master-hack-iosgods_GM406889139.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/minecraft-cheat-client_GM479516143.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/free-tiktok-likes-trial_GM835599320.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/tiktok-views-free_GM835599320.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/roblox-games-with-free-boombox_GM431946152.pdfIn PDF document text
    • https://pengacara-nbp.com/ckfinder/userfiles/files/coinmaster-blogspot_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
font_00_sfnt_off0000326d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x326D 22584 bytes
SHA-256: a85d62ef73d330a70205b622528302a66993302b2db0b74bdf7e9a4c1c55959a
font_01_sfnt_off000064e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64E9 18856 bytes
SHA-256: 58404acbf4e4ab92b6cf069ccee956ef7d679ed1585bf0181da398c79cf0983d

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