Malicious PDF — malware analysis report

Static analysis result for SHA-256 466cb61aea1efa88…

MALICIOUS

PDF

250.1 KB Created: 2021-07-06 13:53:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f8f12a762ff837a639b48957c4cf4c2c SHA-1: 27523dc8cf977a7ae09ac0bbc288051df38df465 SHA-256: 466cb61aea1efa88c99d1eb78a3772e7d202c41fe2e71480fa93fe17ea421319
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1608.001 Stage 1: Upload Malware T1071.001 Web Protocols

The PDF document contains a high-risk heuristic firing for a fake CAPTCHA and a brand-impersonation lure, specifically impersonating Apple. It directs users to a URL that promises game hacks, which is a common tactic for credential phishing or malware distribution. The presence of embedded URLs and the overall structure suggest an attempt to trick the user into interacting with a malicious link.

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-or-g-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-or-g-game-hack PDF link annotation
    • https://perpus.upp.ac.id/digilib/repository/coin-master-free-link_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/dax-she-cheated-roblox-id_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-minecraft-worlds_GM479516143.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/roblox-hack-com_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/is-it-possible-to-get-banned-for-cheating-roblox_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/cmaster-club-coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/tiktok-free-followers-hack_GM835599320.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/get-me-robux_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-get-hair-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/bad-business-cheats-roblox_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/easy-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/roblox-game-dev-life-free_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-robux-earn_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-hack-roblox-accounts-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_off00037cb9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37CB9 25928 bytes
SHA-256: ba2f136c6d5046fa736098f80db884bd4d59bb66137da8aae0cb93747deccfc2
font_01_sfnt_off0003b9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3B9CD 18124 bytes
SHA-256: 2f0d229d956ed260c0a483a125eba47d59a3cbce0ff5323ab18c8b042e5d3609

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