Malicious PDF — malware analysis report

Static analysis result for SHA-256 78cfa4d3bb27d016…

MALICIOUS

PDF

251.3 KB Created: 2021-07-05 18:01:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 701d8655b6b66253bb0ea822410192de SHA-1: 4f5067bc59a7a25213b0095c1eb2aa5a6b2a5eca SHA-256: 78cfa4d3bb27d01634b93b5a0f52084347b5c13d6a44a834b7fd83e75daa5c11
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 0.0099

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-pubg-uc-hack-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-pubg-uc-hack-game-hack PDF link annotation
    • https://fib.ub.ac.id/sac/repository/roblox-free-button_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/what-is-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-obc-cheat_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-more-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-can-someone-hack-my-account-with-username_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-sue-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-magical-chest-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-hack-ninja-simulator-hacked_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/actual-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/twitter-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-hack-coins-in-archery-master-3d_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-roblox-gift-card-codes-2021-unused_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/wwwroblox-freecom_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/all-roblox-games-for-free_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_off00037fda.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37FDA 26028 bytes
SHA-256: 6fc9df7334b598e505af9c019ce7611616d60771594a8dd8e895b0dd03a9c333
font_01_sfnt_off0003bcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BCFE 18604 bytes
SHA-256: 61e3604b7ff24999e99183383d2ded8908dbb51ad208e25341a54085486e2575

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