Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a821b828fa7e48b…

MALICIOUS

PDF

226.2 KB Created: 2021-07-05 13:42:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4dea031f89852489eb4301ec302b6bdc SHA-1: 04c7afbca7fa771a21ea63c3d29fc803ff911aba SHA-256: 4a821b828fa7e48b13700be7dc58d755be842783beb6aab1d6535cebb0b15eb2
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1204.001 User Execution: Malicious Link

This PDF document was flagged as malicious. It uses a fake browser/software-install lure and 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 clean score 0.0118

Heuristics 7

  • 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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.tw/app/1094591345/pokemon-go-free-remote-raid-pass-game-hack PDF link annotation
    • http://lib.uho.ac.id/library/repository/coin-master-invite-friends-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-spins-coin-master-2021-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/corn-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-free-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/avatar-de-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/pubg-uc-buy-ksa_GM1330123889.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-free-skins-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-cheat-engine-values_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/www-free-robux-com_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-using-cheat-engine_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-2021-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-make-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-game-free-download-for-pc_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
stream_023_off00031ce8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31CE8 25576 bytes
SHA-256: d9186c9eaf15f45ff75b878228837b2c2b697483d7fd4a2edba35e3dc7cca030
font_01_sfnt_off000358e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x358E9 18756 bytes
SHA-256: 5c377452472d70cddf2c69d0c39cc3b5ed2cb0b4e5eea8798737a93015118355

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