Malicious PDF — malware analysis report

Static analysis result for SHA-256 1267bf02ede3feb2…

MALICIOUS

PDF

54.0 KB Created: 2021-06-10 12:58:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 820b51d25ef636bc6ef41324f23eaf91 SHA-1: c9edec33852233aef568d2b1ebec687c95f0f031 SHA-256: 1267bf02ede3feb2e4931efaf4d938006d5e7994f8b67a432f23d19ab8dd3db4
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure and a password-protected-archive 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 malicious score 0.9636

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.tw/app/431946152/free-roblox-generator-no-download-game-hack PDF link annotation
    • https://c2o-library.net/catalog/repository/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/pastebin-roblox-800-robux-free-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-free-hats_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/mine-minecraft-games-for-free_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-generator-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-daily-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/pubg-uc-purchase_GM1330123889.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-download-pc-free_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-use-cheat-engine-on-roblox-retail-tycoon_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-card-collection-hack_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-roblox-com_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/hacks-for-roblox-prison-life_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/minecraft-building-hacks_GM479516143.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000530d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x530D 27868 bytes
SHA-256: ab30dd51f526abc0dd37e6fa64aadaeb68571dc7abc5a7f3748951c69575bfdd
font_01_sfnt_off00009286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9286 8752 bytes
SHA-256: c4b6804e72569263c1c67db8b9b315cf8f401f6c0bbd8440bd8f9b9ac43e13d8
font_02_sfnt_off0000af1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF1C 18788 bytes
SHA-256: 12bfab8afa10f2ecb19710a5fd7988db45f92d7f04f3b3bf99ac54f3f1ce667c

Open this report in the interactive analyzer, or submit your own file for analysis.