Malicious PDF — malware analysis report

Static analysis result for SHA-256 1877392d17d7c95d…

MALICIOUS

PDF

35.3 KB Created: 2021-07-09 10:54:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7cc66af3ab13d2a507891b270fc7ed49 SHA-1: 39a8cf6fc159f3b4b800940426a9faf87a3a7003 SHA-256: 1877392d17d7c95d66b194d1c0d0c141797bbf6d5c60018b26459ff33607b3d6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure, specifically advertising free game hacks and generators. The primary link, http://netcdn.tw/app/479516143/free-minecraft-bedrock-server-game-hack, is flagged as malicious. The document body, though partially corrupted, also contains this URL and other similar lures. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

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/479516143/free-minecraft-bedrock-server-game-hack In PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/oprewards-points-generator_GM431946152.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/minecraft-free-version-pc_GM479516143.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/free-minecraft-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/games-that-can-be-hacked_GM431946152.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/cone-master_GM406889139.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/how-to-get-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/itos-fun-roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/roblox-cheat-tables_GM431946152.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/free-robux-link_GM431946152.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/coin-master-instagram-free-spins_GM406889139.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/free-roblox-executor_GM431946152.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/free-robux-just-click_GM431946152.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/how-to-get-free-hack-in-roblox_GM431946152.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/download-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://wwlogistic.net/uploaded_files/userfiles/files/free-2021-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_off0000340b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x340B 22524 bytes
SHA-256: 3c03453203348e6bd721440bdf83cac27583c279d1a6b91b1f488d0bf9a37e0c
font_01_sfnt_off00006633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6633 18672 bytes
SHA-256: 6240c75996215a2b9363c1816ed89e9d7c3b3a872872438457d477396d6a00b8

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