Malicious PDF — malware analysis report

Static analysis result for SHA-256 de23c2a3424f1e90…

MALICIOUS

PDF

46.1 KB Created: 2021-06-04 01:48:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4343127691360c87b63fc26e9f3de669 SHA-1: f77ae8438f0abcceff963bafb6a468e2a5a8b769 SHA-256: de23c2a3424f1e901d15594bcaf2283a3c83938930e5d1a066e08a319a1af773
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a lure for game hacks and impersonates brands like Facebook, directing users to a malicious URL. This suggests an attempt at credential phishing or delivering a second-stage payload. The presence of embedded URLs and a fake CAPTCHA heuristic strongly indicates a malicious intent to trick the user into clicking the link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 6

  • 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
  • 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: https://netcdn.online/app/431946152/how-to-get-more-robux-game-hack.
  • 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 https://netcdn.online/app/431946152/how-to-get-more-robux-game-hack PDF link annotation
    • https://perpustakaan.stami.ac.id//repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/how-to-hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-spin-card-exchange-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/hack-coin-master-download-ios_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-robux-glitch-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/coin-master-hack-app-ios_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/roblox-booga-booga-hack_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-coin-app_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/op-rewards-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/is-windows-10-minecraft-free_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/minecraft-free-online-games_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/how-to-change-your-username-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f99.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F99 29428 bytes
SHA-256: 4513b936a8368cd59f4c2b87c435f7e479d5527c43442a9e7766e1c28057c50e
font_01_sfnt_off00009168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9168 18312 bytes
SHA-256: b63754bab8a539e11eebb32f86c31dbe9ceb60be690df901f3a3ba32c84f6f1e

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