Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d9f7cc2702428b…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 13:32:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1cbe4752a8aa212772ccb48818f692eb SHA-1: d300e7b0d978a610af0f953c058c9338c70124ef SHA-256: f3d9f7cc2702428b8ecf73d8549c7f1a6015d1087687855864ea9e61a76013ff
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising 'game hacks' and 'free spins' for popular games. The primary lure URL is http://netcdn.tw/app/406889139/coin-master-daily-free-spins-and-coins-game-hack, which is flagged as malicious. The document's structure and content strongly suggest a phishing or scam attempt designed to lead users to potentially harmful websites.

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-daily-free-spins-and-coins-game-hack In PDF document text
    • http://katalog.gemalibrary.net/repository/bad-minecraft-free_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/bloxawards-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/hacks-roblox_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/roblox-guess-the-emoji-cheats_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/minecraft-thumbnail-maker-free_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-combine-videos-on-tiktok-free_GM835599320.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/daily-coin-master-free-spin-apk_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/roblox-toy-codes-free_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-get-anything-for-free-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/como-hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/is-roblox-free-on-xbox_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/get-robux-today_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/free-minecraft-svg-cutting-files_GM479516143.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/how-much-pubg-uc-cost_GM1330123889.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/coin-master-online-hack-download_GM406889139.pdfIn PDF document text
    • http://katalog.gemalibrary.net/repository/robux-cheat-codes-2021_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
stream_002_off00003054.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3054 22668 bytes
SHA-256: 1f054bd9218e3013ac226038b8660acef5e385616caf4ce8b86af3c172849727
font_01_sfnt_off000062ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62EF 18772 bytes
SHA-256: a1dc96cae1db032b501f6986f060f4567329d4c170f8890bd2780cb4b8189df7

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