Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9095c1669b73e56…

MALICIOUS

PDF

33.3 KB Created: 2021-07-05 15:09:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d665d2017bba041caf0ea2fd9abc807e SHA-1: 3b553eb635c7ec7cfc6483f9c6005ce99b4bbf9d SHA-256: b9095c1669b73e56c7fb1a302a2e0dc62ffc265b02ec7a2ddfa540ead58665c4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs, including one identified as a malicious redirector. The document body and heuristics indicate a lure for free game currency or hacks, which is a common social engineering tactic. The primary malicious URL identified is http://netcdn.tw/app/431946152/unlimited-robux-game-hack, which likely leads to a further malicious download or phishing page.

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/431946152/unlimited-robux-game-hack In PDF document text
    • http://lib.uho.ac.id/library//repository/easy-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-cards-free_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/e-free-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/i-need-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-cheat-engine-hacks-december-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/xray-for-roblox-for-hacks_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/minecraft-tower-defense-hacked_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coinmaster-links_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coinmaster-spin-ml_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-space-outpost-tycoon-script-hack-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-roblox-accessories-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/any-working-robux-hacks_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-free-download-mac-full-version_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-free-app_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/xray-hack_GM479516143.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_off00002d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D00 21656 bytes
SHA-256: a8a3edbe1200f5eeae954524559175236bbd0a40b8d3220a0c623b745e1fb90d
font_01_sfnt_off00005c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C8C 19284 bytes
SHA-256: facb7e578a1cab29536950ca6e6e4768181c4020f33da1e6d8c95277e0885859

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