Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdf1bddfe6ffbef3…

MALICIOUS

PDF

34.1 KB Created: 2021-07-05 13:07:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 004e71c55aa6650999f76f981915a601 SHA-1: 9e31e47cc55c78a53d365591d871bd9969371133 SHA-256: bdf1bddfe6ffbef3ce42bf04511a3d2931a072da899a501f18f7ffa06f270311
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to websites offering 'hacks' or 'generators' for popular games, such as Coin Master and Roblox. One critical heuristic identified a link to known malicious redirector infrastructure, specifically http://netcdn.tw/app/406889139/coin-master-hack-2021-link-game-hack. This suggests the document is designed to trick users into visiting these sites, likely to download further malware or engage in other malicious activities.

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-hack-2021-link-game-hack In PDF document text
    • http://www.library.umbjm.ac.id/repository/hack-para-roblox-2021-noviembre_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-minecraft-website_GM479516143.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-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-50-spin-link_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/procodes-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-cheat-engine-rs_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-roblox-followers_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-marketplace-free_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-generator-pro_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-18-9-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/fps-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-catalog-slendytubby-clothes-free_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-robux-generator_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_off00002f20.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F20 22812 bytes
SHA-256: f0973d36cc4730c3c6ecb3c6d04004b32ff9b4d3dd05d9dbea1b389f8a1e899f
font_01_sfnt_off00006225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6225 18408 bytes
SHA-256: 8438728008f6ab05b5c9a65d4eeb1f2e5c23a436eadc11c6e76328f72b7d7fb7

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