Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b81446048c439fb…

MALICIOUS

PDF

50.0 KB Created: 2021-06-11 08:40:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a43272829108141294b990ee24914d00 SHA-1: 92f45777a6369ee2b91f6ec716514835c2fb70ad SHA-256: 7b81446048c439fb5c3846dd62bb440bfef3581f9f88e338925fc8e73a700006
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. 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 0.9796

Heuristics 4

  • 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.
  • 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/how-to-hack-other-people-roblox-account-game-hack PDF link annotation
    • https://www.captaingogo.com/uploaded_files/userfiles/files/free-coin-spin_GM406889139.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/tiktok-free-ebooks_GM835599320.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/coins-master-hack_GM406889139.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/how-to-get-free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/how-to-get-free-robux-5-million_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/free-vip-server-roblox_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/coin-master-hack-2021-iphone_GM406889139.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/free-coins-app-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/how-to-get-coin-master-card-free_GM406889139.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/minecraft-apk-download-free-11-055_GM479516143.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/free-spins-coin-master-twitter_GM406889139.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/is-minecraft-free-on-mac_GM479516143.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/free-minecraft-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/minecraft-nintendo-switch-digital-code-free_GM479516143.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/minecraft-apk-android-free_GM479516143.pdfIn PDF document text
    • https://www.captaingogo.com/uploaded_files/userfiles/files/coin-drop-master-free_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000565c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x565C 27136 bytes
SHA-256: 94522bf4ae255b32542e0f76eccbc31c685bed6c8e22b444fa9470af8ec6dc08
font_01_sfnt_off000093ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93BA 3040 bytes
SHA-256: c44607e7c9e0a725bb8cb50a3db0bd965f8daaad196d26d09b52fa090863b17a
font_02_sfnt_off00009e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E45 19088 bytes
SHA-256: 8c1f7590e3492373ef6da1d4d7583c80bc33af5e951ba4f5916c10c075a2af94

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