Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e44c0a782f5ce73…

MALICIOUS

PDF

251.1 KB Created: 2021-07-05 02:13:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ec6c20af9ae95aff926132fb3ceb3168 SHA-1: 18409ee98cfad1e3450045b77c050c1d316f3ad2 SHA-256: 9e44c0a782f5ce73fd63e273976192ba1c356265690519d5b8a6f0b03ee16778
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 0.0115

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-id-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-id-game-hack PDF link annotation
    • https://opac.umrah.ac.id/repository/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-ger-free-robux-with-pastebin_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-robux-gratis-sin-hacks_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/cheat-to-make-my-damage-higher-on-da-hood-roblox_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/tiktok-free-advertising_GM835599320.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-no-human-verification-or-survey-generator_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-cheat-excecuter_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/my-boyfriend-cheated-on-me-roblox_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-december-hack-2021_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-get-free-admin-in-roblox_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-how-to-get-free-skins_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-do-i-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-promo-codes-2021-roblox_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-free-online-game_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-free-spins-hack-2021_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/gratis-robux-hack_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/speed-hack-new-way-jailbreak-roblox_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_off00037fdc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37FDC 26180 bytes
SHA-256: 5a6ef4ef0bd83371e165b0eaeb54bfc80de217461a5054099e13a348414aaf97
font_01_sfnt_off0003bd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BD4D 18300 bytes
SHA-256: 20e10dd218daaf29e251ef1409d583983e0fd6ca7ea28722ac298156b8fc88cd

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