Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e361c6eff164fd…

MALICIOUS

PDF

250.6 KB Created: 2021-07-05 19:03:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 94de601271ca3b0e348521abef503e74 SHA-1: f154d6770af01ac4dbe345df7b67f30278bca6e3 SHA-256: b5e361c6eff164fdbafee55898ed6ee322d80056ee80b5c80926ebf2f975b0bf
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/how-often-pubg-uc-roots-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/how-often-pubg-uc-roots-game-hack PDF link annotation
    • http://lib.stie-aub.ac.id/repository/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-redwood-prison-free-gamepass_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-c9m_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-roblox-accounts-2021-facebook_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-game-free-download-for-pc_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-download-hacks-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/cheat-engine-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-install-minecraft-for-free-on-ios_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-make-roblox-tool-script-hack_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-paypal-hack_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-hack-sahrbite-pastebin_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-hack-lumber-tycoon-2-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-gift-card-codes-wikia_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/http-wwwfree-robuxcom_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-rixty-codes-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-hack-yourself-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-free-robux-2021-easy_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_024_off00037cb3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37CB3 26284 bytes
SHA-256: caee0cb8e6b3d4939c0cdfd2950ba97d84e1d590b232423af85df81dbdf26cf0
font_01_sfnt_off0003ba43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BA43 18536 bytes
SHA-256: e91eabb1018d779497dee3fab2ef608e3e60a13a16f949f2add25f26965633d2

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