Malicious PDF — malware analysis report

Static analysis result for SHA-256 18cf69e546dc9132…

MALICIOUS

PDF

40.0 KB Created: 2021-05-02 14:42:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 43ebcbc2e540b820398455db45939687 SHA-1: 7cd606895fce3d5fadf5b88f006868fdd317900c SHA-256: 18cf69e546dc9132d8b3b6233a8121edf6397fdff8f21e7c31fbae17e12c3d11
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for free Robux and game hacks, directing users to a malicious URL. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were extracted, the embedded malicious link is the primary indicator of compromise, likely leading to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 https://netcdn.xyz/app/431946152/free-free-robux-apps-game-hack In PDF document text
    • https://lib.stie-yai.ac.id/repository/hackear-roblox-escape-prison.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/how-to-get-10-million-free-robux.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/hack-no-virus-roblox.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-free-no-download-unblocked.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/how-to-make-robux-fast-and-free.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-robux-by-roblox-robloxcom.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/pastebincome-robux-hack.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-robux-card-no-humaon-verification-2021.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/get-free-robux-without-hacking.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-roblox-mobile-app.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
stream_003_off00004102.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4102 25752 bytes
SHA-256: 6e4ee684cb371b84bbde9066bbef24aa06254ee016d9b20faf0d68920da77cff
font_01_sfnt_off00007ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB5 18192 bytes
SHA-256: f4fd8c7733ff5206b2f8bd7c8070fcbd44da91b98f2e5f0c339dfdf21c58374d