Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9794a3e7c226e2c…

MALICIOUS

PDF

250.8 KB Created: 2021-07-05 14:57:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: dec6e306619b3bf86eb82f9fe53a0749 SHA-1: 6e93279324c2c55d4f114b0e653a70c698e7d6c8 SHA-256: c9794a3e7c226e2cadee0a55f16f6272c4d5e9c0f305aa57f45064df2e2ec57e
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1534 Steal or Forge Credentials T1190 Exploit Public-Facing Application

The PDF document contains multiple high-severity heuristics indicating a credential phishing and MFA harvesting lure, impersonating Apple. It directs users to external URLs, including one using an IP address, which are likely part of the phishing infrastructure. The presence of a fake CAPTCHA and urgency lures further support the phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier clean score 0.0098

Heuristics 9

  • 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-lucky-spin-game-hack.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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-lucky-spin-game-hack PDF link annotation
    • http://202.56.165.220/digilab/repository/free-stuff-on-roblox_GM431946152.pdfPDF link annotation
    • http://202.56.165.220/digilab/repository/coin-master-apk-hack-download_GM406889139.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/roblox-games-to-hack_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/free-robux-come_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/free-roblox-codes-2021-not-expired_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/roblox-games-for-free-no-download_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/free-roblox-accounts-with-robux-2021-list_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/how-to-get-free-20210-robux-esay-and-fast_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/free-robux-videos_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/download-roblox-for-free-on-ps4_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/how-to-hack-a-roblox-accoutnt_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/free-robux-no-email-no-download_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/9-legit-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/roblox-work-at-a-pizza-place-money-cheat-2021_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/robux-cheat-app_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/roblox-welcome-to-bloxburg-money-hack_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/speed-hack-roblox-lumber-tycoon-2_GM431946152.pdfIn PDF document text
    • http://202.56.165.220/digilab/repository/coin-master-free-link-blogspot_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_off00037d89.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37D89 26028 bytes
SHA-256: 91317fe63e0e831ac5a6ff53f454c4f3048cc0287ea154b5ff21ebf90bc716ea
font_01_sfnt_off0003baca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BACA 18772 bytes
SHA-256: 2897494f0465d0f0d3e911d698ae065519cf7fe29d3dd9d8cbf508eb6acfc730