Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9cfa81fd3e17b87…

MALICIOUS

PDF

47.8 KB Created: 2021-06-11 11:08:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: c312570d7c7798ced2f398e7bd045282 SHA-1: df16e93fcb2cb54f59d78f18b12082e24efd7cfe SHA-256: b9cfa81fd3e17b87c197d7dafda7bacb14fe8b8bee61156604e31662463d6dfb
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 fake-CAPTCHA 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 0.9832

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.tw/app/431946152/new-roblox-logo-gives-free-robux-robuxian-game-hack PDF link annotation
    • http://perpustakaan.stikim.ac.id/slims/repository/apk-roblox-hack-pc_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/how-to-get-minecraft-bedrock-edition-for-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/202100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/robloxs-got-talent-cheat-tuto_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/free-roblox-object-en-vedette-code_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/space-frontier-beta-release-hack-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/coin-master-free-coins-twitter_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/free-faces-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/free-downloads-for-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/roblox-protosmasher-download-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/free-roblox-like-botsw_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.stikim.ac.id/slims/repository/roblox-obby-that-gives-you-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
stream_004_off00005364.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5364 28816 bytes
SHA-256: 526c7a17a1796f509731774d4fa3f47682ed4ba3a63c075cd9837331fe75e98a
font_01_sfnt_off00009614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9614 19000 bytes
SHA-256: e7e0dd337fa5844d0df58b0fa16cd9a625bdbe017346db80ba92e156c8f85fb6

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