Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b8e32447552cff…

MALICIOUS

PDF

33.6 KB Created: 2021-07-05 07:17:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 3124375a7aea9798c2c2f9a21ec599e8 SHA-1: c623825b8d3330ca222c9fdbd8abe013e3d6b3d2 SHA-256: b3b8e32447552cff72627268c6473fa3822bfa880cd599da852770eebe0fe04e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising 'free Robux' and 'game hacks' to lure victims. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest a social engineering tactic to drive traffic to potentially malicious sites or download further payloads.

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-legit-game-hack In PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-account-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-level-6-exploit-roblox_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-blogspot-links_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-link_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-generator-hack_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/facebook-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/deluxe-ninja-sword-for-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-coin-master-spins-blogger_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/hack-full-slot-script-roblox_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-get-free-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/offers-to-complete-and-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-spin-link-in-coin-master-game_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-5-tiktok-likes_GM835599320.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-robux-grouos_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-free-daily-spins-link_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_off00002d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D42 22028 bytes
SHA-256: 4cf58dad5344c23e223ff70dfa444fd08afedae1c82a1a922915b9fdef68e705
font_01_sfnt_off00005e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E44 18940 bytes
SHA-256: 794d8ecd233df1702e9bde6a16c5f654292374bf49d8c1531efb1b5eb25ac7e0

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