Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2078240dbef9005…

MALICIOUS

PDF

44.8 KB Created: 2021-06-11 11:07:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a9b593ab21c45394aa5c7084407bd14b SHA-1: c8660bbb8526d7004762410b983cc92d46d8b0b1 SHA-256: f2078240dbef9005903b8f192c0ccc645f78f4b1dad5e2d6286f4071d33f4f8c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure, specifically advertising free generators and hacks for popular games. The primary malicious URL identified is https://netcdn.tw/app/431946152/roblox-all-free-stuff-game-hack. The presence of these links and the ML classifier's high confidence score indicate a phishing or scam attempt designed to lead users to potentially harmful content. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.tw/app/431946152/roblox-all-free-stuff-game-hack In PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/coin-master-tiradas-gratis-2021_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/coin-master-hack-2021-android-apk_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/free-roblox-toy-codes-not-used_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/mcpe-master-hack-unlimited-coins-download_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/is-minecraft-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/hacks-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/coin-master-hack-cheat-generator-d_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/cheat-list-roblox_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/free-spin-generator-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/coin-master-free-spins-no-generator_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/coin-master-lucky-patcher-hack_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/this-group-gives-free-clothes-robloxs_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5314 25484 bytes
SHA-256: dbca968a68dd472d64b69fa8991a038f7076ab73a8acc87bed15628f033ccc5f
font_01_sfnt_off00008ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CA2 18192 bytes
SHA-256: 780c1ae1c0acd50b987d1ceec85da4367f3cb31d08b922fa00b5ef8ac949df63

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