Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd941b88de7aef5…

MALICIOUS

PDF

34.5 KB Created: 2021-07-06 13:02:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 449196f5b36f22a86ea05f06768de793 SHA-1: 9e6fe0a90d71c860efe4e37ac94ff87a2cdc4568 SHA-256: 8dd941b88de7aef5534408232e6d6b2c3b7f02b8ab6bdd42d99665bee8c48af3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising 'free Robux' or game hacks. The document body and embedded URLs suggest a lure to trick users into visiting these sites, which likely host further malicious content or scams. No scripts were extracted, but the presence of multiple malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

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/free-robux-no-offers-game-hack In PDF document text
    • http://libnh.stikesnh.ac.id/repository/claim-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-hack-on-club-boates-roblox_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-coin-master-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-roblox-gift-card_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-to-play-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-change-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-hack-ios-no-human-verification_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/a-tool-to-get-free-in-roblox-purchases_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/best-free-roblox-executor_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-diamonds-coin-master_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-hack-without-root_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-free-spins-5-10-2021_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-free-spins-link-2021-no-verification_GM406889139.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_off000030d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30D2 22432 bytes
SHA-256: 645d7caacc6eeca9b605efe78fe71400eb439e87553ed03dbdb5590aaffff261
font_01_sfnt_off000062f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62F2 18716 bytes
SHA-256: 6cef72b87605a464df8901898d024a902d738decefc8e487a7362df6534fb924

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