Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f21e6585dd2a0d…

MALICIOUS

PDF

34.6 KB Created: 2021-07-06 14:57:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: af2668469129ed284af6502359acc6c9 SHA-1: f33a69f00c98909cb30165789ba177babc8e94db SHA-256: b2f21e6585dd2a0de5c7b57dbe0b4b6d9e5b58923d298dae19a48abc69295baf
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including a prominent one to 'netcdn.tw' disguised as a game hack. This heuristic firing indicates a lure designed to trick users into visiting a potentially malicious site. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to external resources, likely for malware distribution or phishing. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-hack-online-cheat-game-hack PDF link annotation
    • http://chem.ipb.ac.id/kim/repository/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/roblox-games-free-items_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/how-to-hack-robux-on-pc-2021_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-heaven-links_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-link-app_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-free-robux_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-robux-live_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/how-to-get-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/static-moonactive-net-free-spins_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-free-spins-2021-app_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/cheat-download-for-hacking-roblox_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/give-me-robux-now_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/robux-generator-com_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/how-to-hack-accounts-on-roblox-2021-october_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/how-do-you-get-roebucks_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/minecraft-windows-10-free-code_GM479516143.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/tower-of-hell-roblox-hack_GM431946152.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
font_00_sfnt_off000031b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31B9 22828 bytes
SHA-256: de7eab17b4526b8c43ebb3b3c08e1d9a1b267388bfd5980452545a83d1d1e084
font_01_sfnt_off000064d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64D5 18244 bytes
SHA-256: 4a6d454e3ee6c1dcb03a272ca36e6340e030a828ec80bd2668db4bff24f8dce7

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