Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef9bed82595905f…

MALICIOUS

PDF

32.3 KB Created: 2021-07-05 14:01:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8c39942507272a5e8f6b150f876b8f56 SHA-1: c0b725102dec40a0ef651c29004779e16a1c232c SHA-256: 9ef9bed82595905fab6144a4913244c04c458a8aada9bc5d21a5ce9f27bd577b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links to a redirector hosted on 'netcdn.tw', which is flagged as malicious. The document body and embedded links suggest a lure for game-related cheats or currency, likely a phishing or scam attempt. The presence of embedded URLs and the nature of the lure indicate a phishing attachment, with the primary goal being to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/431946152/game-for-have-a-robux-free-game-hack In PDF document text
    • http://www.library.umbjm.ac.id/repository/spin-and-coin_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-windows-10-edition-free_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-gold-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-dll-hack-352021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/robux-hack-no-survey-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-online-pc_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-twitter-hacked_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-coin-link_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-cheat-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-net_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-coins-2021-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/aesthetic-roblox-outfits-free_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/rbx-land-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-cydia_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/halloween-free-skins-roblox_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_off000029c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29C8 21764 bytes
SHA-256: b88bfcd9b0779a00766b5d91f1c906aae9af30e1b8898ae3086958bcbda28b17
font_01_sfnt_off0000595b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x595B 19092 bytes
SHA-256: 849a016cdb604b30a6616b165d8f2362430270501dbffc8d2282af08e42d68f1

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