Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4860857669f0ca5…

MALICIOUS

PDF

34.7 KB Created: 2021-06-28 01:37:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 58eb14ae8104a8bd41d89d724aab28c3 SHA-1: 46c621ba9f7871c473fff277ed4c7b9d3f57db2b SHA-256: b4860857669f0ca5ae3861c8163400d6a372dd6bc1bfa02552b69f68c4fe08fb
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many pointing to other PDF files, suggesting a link farm or SEO manipulation tactic. The primary lure is 'Earn Free Robux', a common theme in scams. While no scripts were extracted, the PDF structure and embedded links indicate a malicious workflow designed to redirect users to potentially harmful content or further stages of a campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.co/app/431946152/earn-free-robux-game-hack PDF link annotation
    • http://repository.poliven.ac.id/repository/aimbot-exe-roblox_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/free-accounts-logins-and-passwords-roblox_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/como-volar-en-roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/re-ghoul-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/cheats-roblox-mine-simulator-julio-2021_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/free-whatsapp-tik-tok-status-download_GM835599320.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/como-descargar-hacks-de-roblox_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/i-was-hacked-roblox_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/pubg-uc-number_GM1330123889.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/roblox-free-jump-animation_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/how-to-get-free-spins-on-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/coin-master-heaven-free-spins-link_GM406889139.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/get-free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/como-conseguir-monedas-infinitas-y-tiradas-de-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/free-roblox-account-v3rmillion_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id/repository/robux-hack-vidio_GM431946152.pdfIn PDF document text
    • http://repository.poliven.ac.id//repository/robloxheroxyz-free-robux_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_off00003202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3202 22256 bytes
SHA-256: 158cbc3690d8885b68dd673bf08e6aee6c02b229626b825a236957bd11d641bb
font_01_sfnt_off0000638d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x638D 18716 bytes
SHA-256: 8f38c6e249cfb46641478d2db6e31ecd999c597cf7db8b591ffee8c5f62f2864

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