Malicious PDF — malware analysis report

Static analysis result for SHA-256 866c85d6de01d8a3…

MALICIOUS

PDF

34.0 KB Created: 2021-07-06 14:42:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: fb89444daa907c4250b4c0b4ec82fc15 SHA-1: 2d9bfeb92685af520a185e8e044883c71a4cb0b1 SHA-256: 866c85d6de01d8a36ed13fa0e672d7cf63ca043fca3225e2d6da68cddebc5aeb
142 Risk Score

Malware Insights

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

This PDF document employs a lure of free game currency and hacks to entice users. It contains a large number of external links, identified as a PDF link farm, directing users to various game-related hack sites. The primary URL http://netcdn.tw/app/406889139/free-spins-on-coin-master-2021-ios-game-hack is a clear indicator of a scam or potentially malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a malicious workflow, likely involving redirection to exploit kits or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/406889139/free-spins-on-coin-master-2021-ios-game-hack PDF link annotation
    • http://lib.fisipumt.ac.id/repository/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/coin-master-free-2021-spin-link-today_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/cheat-engine-btools-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/i-will-hack-and-not-kill-parent-fashion-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/www-free-robux-com_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-change-name-hack-pastebin_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-vehicle-simulater-hacks_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/hex-number-gives-free-robux-hack-created-by-robuxian_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/pubg-90-uc_GM1330123889.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-robux-generator-robux-tix-hack_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/como-hackear-el-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-icu_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/can-i-download-roblox-for-ps3-free_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-robux-hack-no-download-no-survey-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/safe-hack-for-coin-master-android_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-robux-generator-tool_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/como-hackear-coin-master-2021_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_off00003033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3033 22228 bytes
SHA-256: 4bf234184280e05deaa6eb10c72f323b8518072406c74c758786692706634698
font_01_sfnt_off0000615a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x615A 18576 bytes
SHA-256: 2bcc00c8b514798c5e9e3413f1d3857e1ac65e8691b0e4a0078912bca2c3dd84

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