Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b412cecceda2f0…

MALICIOUS

PDF

45.8 KB Created: 2021-06-03 04:49:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 49de66161694cf8549c375c7ac766211 SHA-1: 177419e33d348dee9e528955f629e64edca1c256 SHA-256: a1b412cecceda2f0a6c5fc974ccce590114fa41913ca9f0c099c81cc47038676
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 0.9864

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.online/app/431946152/free-robux-that-actually-works-game-hack PDF link annotation
    • http://library.ulb.ac.id/repository/hack-avatar_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/worst-roblox-avatars_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-hack-app-for-ios_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/robuxglobalcom_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-coin-master-cards-link_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/mcpe-master-hack-unlimited-coins-download_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-pokeballs-in-pokemon-go-free_GM1094591345.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/is-coin-master-free_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-shields-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-free-spin-link-twitter_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-mod-version-free-download-2021_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/face-png-roblox-hacker_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_off00004f60.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F60 27120 bytes
SHA-256: 56b3d15cbace463c72ccb0e641f103c9796a11db877ce866ea0b485dd80bf4ef
font_01_sfnt_off00008df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DF7 19136 bytes
SHA-256: e9e8736bed1826902485352f20294e96b644ee357cd6186db79dc9b33c578c67

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