Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e208a9974e890b…

MALICIOUS

PDF

39.7 KB Created: 2021-04-26 16:42:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1c537a709f5bb21803886d2193755219 SHA-1: ec8f664bcb213b367733677f84a03a7c5abb3ef2 SHA-256: 91e208a9974e890b6a8e0b1ea7656a8156bbfa33eb093c84fab3138220937d1e
168 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirectors and other PDF files, all related to 'free Robux' and game hacks, indicating a phishing or scam lure. The heuristic firings confirm the presence of malicious redirector links and a lure for game hacks. The document body explicitly contains the URL 'https://netcdn.xyz/app/431946152/free-robux-gruops-game-hack' and a call to action to access a generator, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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-robux-gruops-game-hack In PDF document text
    • https://lib-stie.yai.ac.id/repository/free-gfx-render-roblox.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/games-that-give-u-free-robux-2021.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-sex-games-free-entry.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/robux-gift-card-redeem-free.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-ton-hack-on-roblox.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-raindrop-roblox.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/hack-t-shirt-roblox.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-get-free-robux-in-roblox-waitseds-no-time.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-get-free-robux-2021-ad.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-get-free-robux-no-password-on-ipad.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_off00003f67.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3F67 25188 bytes
SHA-256: c165a1b002ce47a12b64067f28563ef856d6c4e77945beaa992090f25dc47d13
font_01_sfnt_off0000797f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x797F 18192 bytes
SHA-256: d716b1ac84dbf443c7dd5793d3eb632b9ebbceb73598b4a88fb598153e393bbe

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