Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d6c855c56993a3c…

MALICIOUS

PDF

250.4 KB Created: 2021-07-06 10:21:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 9e5c6c320e014739559b2584b1ab0ac4 SHA-1: 6b9c047f1c31cee92353d35ce3d45813fbe07d80 SHA-256: 9d6c855c56993a3cdc2c62848efbb10168fa10884a477e213406d3f7be605a04
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious. It uses brand-impersonation credential phishing, a fake-CAPTCHA lure, an MFA/2FA-themed lure and an urgency-based 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 0.0098

Heuristics 8

  • 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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: http://netcdn.tw/app/1330123889/is-pubg-uc-hack-possible-game-hack.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/1330123889/is-pubg-uc-hack-possible-game-hack PDF link annotation
    • http://library.ft.upnvj.ac.id/repository/minecraft-hacks-xbox-one_GM479516143.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/how-to-hack-robux-with-artmoney_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/coin-master-free-coin-hack_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/are-robux-generators-safe_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/hacks-in-horrific-housing-roblox_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/how-to-get-to-village-3-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/cm-spin-link_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/coin-master-apk-mod-hack-download_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/coin-master-free-items_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/coin-master-latest-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/coin-master-generator-free_GM406889139.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/roblox-template-free_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/lua-script-hack-dinosaur-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/how-to-get-free-robux-easiest-way-september-2021-yummers_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/robux-win_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/free-roblox-cards-codes-2021_GM431946152.pdfIn PDF document text
    • http://library.ft.upnvj.ac.id/repository/free-online-minecraft-server_GM479516143.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_024_off00037c58.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37C58 25928 bytes
SHA-256: 5b0fa5bbbb2934510956c2d3f7d7f8e8f205c831286228c9b31243339b094d80
font_01_sfnt_off0003b974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3B974 18632 bytes
SHA-256: 0b9601a978810063e439b5086895ebe293832f1a71f6ed1b327824e74e625449

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