Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a4637f680b69b32…

MALICIOUS

PDF

250.2 KB Created: 2021-07-05 21:51:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a9ac1b3f7577e9b1d9ed5f4e2c962a09 SHA-1: b11afedbd29b560cf3fc3c9db2ec5eee466bcad8 SHA-256: 3a4637f680b69b3258508a320d945fe7cc27fcd3182426d734e32dbf90166eee
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1534 Steal or Forge Credentials T1204.002 Malicious Link

The PDF document contains multiple heuristics indicating a phishing attempt, including brand impersonation (Apple) and a fake CAPTCHA lure. It directs users to a URL that is likely intended to harvest credentials or abuse multi-factor authentication. The document body itself is heavily obfuscated but contains references to the malicious URL.

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-in-cheap-price-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-in-cheap-price-game-hack PDF link annotation
    • http://digilib.stie-yppi.ac.id/repository/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-attack-hack_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/robloxgamehackonline-verification-problem_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/minecraft-apk-free-download-016-0_GM479516143.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/roblox-free-bruteforcer_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-audio-upload-for-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/roblox-jailbreak-free-moolah_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/roblox-hack-v1-2-download_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coins-master-hack_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/kazok-roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/how-to-hack-in-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/cute-free-roblox-clothes_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/is-roblox-free-onphones_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/how-to-get-free-robux-using-hdmi_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/level-coin_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coinmaster-rewards_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_024_off00037bb7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37BB7 26180 bytes
SHA-256: bd31683962e7d9d9898a5ae40b0520255edcb44a0462e39398943510fcc8eeb5
font_01_sfnt_off0003b925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3B925 18588 bytes
SHA-256: afa66f7df964db5f44a4e37f6534cb0a5c7138c1e657390297c3582e09f58ce1

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