Malicious PDF — malware analysis report

Static analysis result for SHA-256 41eaa573e21d3355…

MALICIOUS

PDF

249.8 KB Created: 2021-07-05 15:33:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 23f5bd1ac2423a4486e45c635a2ac428 SHA-1: ccff597bd1d83829bf14d0197d9fdf18ce8f6b28 SHA-256: 41eaa573e21d33554dbddfb53a42f8316e404af6328fd1e693578e89e2cd68dd
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 0.0098

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-pakistan-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-pakistan-game-hack PDF link annotation
    • http://perpusfkip.upstegal.ac.id/repository/2021-free-robux-no-website_GM431946152.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/roblox-free-robux-hack-i-impress-all-your-friends_GM431946152.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/roblox-free-hair-girl_GM431946152.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/infinite-jump-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/how-to-get-free-robux-with-inspect-element-2021_GM431946152.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/how-to-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/how-to-get-free-packages-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/roblox-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/free-minecraft-servers-to-join_GM479516143.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/blackout-hack-roblox-download_GM431946152.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/how-to-setup-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/minecraft-kill-aura_GM479516143.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/minecraft-gun-games-free_GM479516143.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/coin-master-generator-free_GM406889139.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/change-roblox-username-free_GM431946152.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/robuxian-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/roblox-free-items-2021_GM431946152.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/roblox-free-body_GM431946152.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/roblox-hack_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_off00037a05.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37A05 26028 bytes
SHA-256: 09cad4a44f6af326d756b86e4a6da127da40c8f53fe18318681714554a5e6512
font_01_sfnt_off0003b75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3B75C 18520 bytes
SHA-256: d9aac98f3256cee09521726910b7d1f31de52c93130801f6ce71aafbe5e2798d

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