Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b2d0b573fa9afce…

MALICIOUS

PDF

34.1 KB Created: 2021-07-03 21:40:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 425a0fee11f9adbfd2baf057f2a8db71 SHA-1: 33d8af67e56195eaeb721d2d8761580ad989b309 SHA-256: 2b2d0b573fa9afcec1b4d91bb8589d3ebb5d9f64dac0de1df6da61299604aafd
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are disguised as game hacks or generators for popular games like Coin Master and Roblox. The document body and heuristics indicate a lure to download or access these 'hacks', which is a common tactic for distributing malware or conducting phishing. The presence of a link farm and the ML classifier's high confidence score further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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 http://netcdn.tw/app/406889139/hack-crack-for-coin-master-currency-game-hack PDF link annotation
    • http://library.ulb.ac.id/repository/how-to-get-free-robux-without-scams_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-roblox-account-with-rpbux-password_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-hack-salto-otros-jugadores_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/online-coin-master-hack-here_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/cheat-roblox-jailbreak-tembus_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/funny-free-roblox-t-shirtd_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/can-you-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-hack-ios-app_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-roblox-groups-with-funds_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-hack-tool-no-survey_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-robeats-cheat_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-speed-hack-on-roblox-no-cheat-engine_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/op-rewards-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-generator-1-step_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-minecraft-resource-packs_GM479516143.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_002_off00002eec.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2EEC 22752 bytes
SHA-256: d49bcff5aec4b6f64d790df602f01a4a4690178fc295492a3b568754507c8761
font_01_sfnt_off000061f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61F6 18488 bytes
SHA-256: 811fb9faacbe1105700380dc3d300d6af0061f738aadd421b3841696441b41e5

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