Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f31d0f3ecdf4623…

MALICIOUS

PDF

34.2 KB Created: 2021-07-05 23:40:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 5ac8c82b22f72b70170d2a6b8c3d78a6 SHA-1: bee047318594d2fe5e5c5f971e0f7ede35f5a70c SHA-256: 8f31d0f3ecdf462360087ab6528aa78f8e5897083a8224c52751bab696873f17
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links designed to lure users to external sites, including a known malicious redirector. The document body and heuristics indicate a scam related to free Robux and game hacks, likely intended to lead users to phishing or malware download pages. While no scripts were directly extracted, the PDF structure and embedded links suggest a multi-stage attack leveraging external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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-com-roblox-game-hack In PDF document text
    • https://perpustakaan.urindo.ac.id/repository/how-to-put-cheat-codes-roblox-bubble-gum_GM431946152.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • https://perpustakaan.urindo.ac.id/repository/roblox-free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • https://perpustakaan.urindo.ac.id/repository/roblox-free-login_GM431946152.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/latest-free-spin-coin-master-daily_GM406889139.pdfIn PDF document text
    • https://perpustakaan.urindo.ac.id/repository/free-spins-on-coin-master-cheat_GM406889139.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/coin-master-free_GM406889139.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/how-to-earn-robux-fast_GM431946152.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • https://perpustakaan.urindo.ac.id/repository/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • https://perpustakaan.urindo.ac.id/repository/be-a-hacker-on-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.urindo.ac.id/repository/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.urindo.ac.id/repository/how-to-get-hacks-scripts-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/free-generator_GM431946152.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/free-roblox-clothes-for-your-avatar_GM431946152.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.urindo.ac.id/repository/cheat-engine-roblox-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.urindo.ac.id/repository/tiktok-free-2021-views_GM835599320.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_off00002f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F6B 22236 bytes
SHA-256: da3463b7a3124cb11d3afccbb1b754c5ba34ce252a331023ff7143b502e7f256
font_01_sfnt_off000060e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60E3 19052 bytes
SHA-256: f1c402a5b139f7054ce39ccfb5800536152a5b826a5c5a7ec81e6f9b67a9d2f8

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