Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c3e1b105cc9f1f…

MALICIOUS

PDF

34.1 KB Created: 2021-07-05 20:02:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 0a72a1d9d2c2570e8d6a994a9fc163e8 SHA-1: 8163e62d31f646578892cfa70f7c5b9d7db3a7db SHA-256: 59c3e1b105cc9f1f5fbbd451f2adfbaa6b7026703299faf933a55b064d6aa088
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to redirector infrastructure, specifically advertising game hacks and generators. The primary redirector URL is http://netcdn.tw/app/406889139/coin-master-free-shield-link-game-hack, which is flagged as malicious. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the document structure and embedded links strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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-free-shield-link-game-hack In PDF document text
    • http://www.library.umbjm.ac.id/repository/cookies-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-imagine_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-games-for-free-no-sign-up_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-many-tiktok-free-accounts_GM835599320.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-robux-no-download-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-code-script-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-fire_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-printable-roblox-images_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-game-hack-app-download_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-change-values-on-roblox-with-cheat-engine_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-discord_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/card-hack-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/robuxglobalcom-no-verification_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-pink-free-robux_GM431946152.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
font_00_sfnt_off0000309a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x309A 22176 bytes
SHA-256: e8ebef8234fcc0724d268abcc9a41d1db31283b7ba8c478a1b9b45e6be097e64
font_01_sfnt_off000061a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61A7 18580 bytes
SHA-256: 28ee47efd6c2d2ec5d8d6e69d99c6b14bf9fd67f9a78f80b4c32aabff95defac

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