Malicious PDF — malware analysis report

Static analysis result for SHA-256 99601a0cfd00f65c…

MALICIOUS

PDF

250.9 KB Created: 2021-07-04 23:09:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 98c83ea16a97cdf058a3a4c129dabfed SHA-1: cd5c5f6304554a0eb06a728e77b16e735cec05f4 SHA-256: 99601a0cfd00f65c0498cdd02dcac7bac967a0dc2205b41a9ef354e637f0ec10
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/pubg-uc-20219-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/pubg-uc-20219-game-hack PDF link annotation
    • http://oca.undil.tl/repository/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-watch-ads-for-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-red-spikey-hair-roblox-that-is-actually-free_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/isuku-roblox-free-shop-hose_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-spins-for-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-32-hack-apk_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-android-zephplayz_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-and-bc-from-website-clone_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-pins_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spins-link-2021-app_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-club_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-how-to-get-a-non-free-model_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_off00037d86.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37D86 26284 bytes
SHA-256: 2122d6764bf620f6cb8b7cb5df3662d837a6741271f40470d005c00a4d10a5e5
font_01_sfnt_off0003bb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BB21 18692 bytes
SHA-256: 122c620b53192ec81f9dded30f7203071199615a06494621465f842b39dde08f

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