Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9667c270c794a61…

MALICIOUS

PDF

35.3 KB Created: 2021-07-06 02:28:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c3cf704d3666e778150ffd973b088d05 SHA-1: c91620da58df41c6989b2ed0d8d0c247a2dbd83b SHA-256: d9667c270c794a610341d9d0b49b3552aaafea6747bec6b2d59ad027ac4d8e72
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a redirector hosted on 'netcdn.tw', which is flagged as malicious. The document body and embedded URLs suggest a lure for game hacks and generators, aiming to trick users into clicking the malicious links. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a phishing or redirection attempt.

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-game-free-download-game-hack In PDF document text
    • http://stikespantirapih.ac.id/home/repository/design-it-hack-roblox_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-clothing-hack-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/pubg-600-uc-price-in-pakistan_GM1330123889.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/minecraft-free-ios_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/minecraft-story-mode-free_GM479516143.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/how-to-do-roblox-hacker_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-roblox-shirt-templates-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-free-modles_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/comment-jouer-a-roblox-avec-une-manette-free_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/como-robar-cualquier-cuenta-de-roblox-hack_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-mad-city-hack-deutsch_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/gaming-cheats-roblox_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/master-coin-free-link_GM406889139.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/roblox-hack-khol-admin-perm-codes_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/free-robux-generator-no-survey-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://stikespantirapih.ac.id/home/repository/games-to-get-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_off0000324b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x324B 22988 bytes
SHA-256: 5422546813d1a233b4a3a800602580fa9659f65521cb4b19bad129c6ed3d75c0
font_01_sfnt_off000065c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65C0 18840 bytes
SHA-256: 251319c71aad5604d240b441aa5cc8cedb9f545f6d327a4f8d7ec96abfbef9e2

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