Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff8a66b322ba7ab2…

MALICIOUS

PDF

49.1 KB Created: 2021-06-11 04:44:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3c0768356c09d03e30aa807154b0967d SHA-1: 43cf099a7f65cebd0bf54c0a1c1f206087bdf18c SHA-256: ff8a66b322ba7ab2c27c37accebef6c351b7f0f6ab9662d42368138ef8f4cb5b
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 0.9796

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/how-to-get-free-robux-without-builders-club-game-hack PDF link annotation
    • https://pustaka.widyakartika.ac.id/repository/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-mod-version-free-download-ios_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/hax-teamcf-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/minecraft-windows-10-edition-free-download_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-mast-hacks_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-robux-link_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-download-roblox-infinite-jump-real_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-hack-download-android_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-free-spins-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/get-free-robux-info_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/hack-roblox-boxing-simulator-2_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/download-free-roblox-clothes_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-to-use-noclip-hacks-roblox-2021-november_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/roblox-piano-hack_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/real-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000054f9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54F9 26364 bytes
SHA-256: 5059165cdc72d66baaa099458b1005a4da9eb8a6c66691f7524e255caa7f9e79
font_01_sfnt_off0000914b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x914B 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off00009afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AFC 19016 bytes
SHA-256: c5a766453831d4c9e1bba27a628c001b3dd75af8314e6b52d95b9e6f559198a5

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