Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f71a09acc0841c…

MALICIOUS

PDF

50.5 KB Created: 2021-06-03 22:03:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 813b45cf049624094d655f016087580d SHA-1: 036f74a0c71d7c787b298c67b04c7f8b5eb6b656 SHA-256: 11f71a09acc0841cfd46dae18281c926f537f829fb674a7eae938c96053089a3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains embedded URLs and a visual call-to-action button, directing users to websites that promise free Robux. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URIs and the lure of 'free Robux' strongly suggest a phishing or scam attempt, likely leveraging a social engineering tactic to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9779

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.online/app/431946152/how-to-get-free-robux-for-kids-game-hack In PDF document text
    • http://www.js100.com/uploads/ckeditor/files/roblox-hacked-com-2021_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-minecraft-thumbnails_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/best-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-spins-11-01-2021_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-free-coins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-hack-tool-pc_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-spin-27_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-free-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-download_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/minecraft-svg-images-free_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-roblox-intros_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-make-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005401.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5401 27244 bytes
SHA-256: 2aade4cbba575b2c49979a2311d32a0b225ff339fb171e4cfaabf20903f74af0
font_01_sfnt_off000094cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94CB 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off0000a1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA1DC 18576 bytes
SHA-256: d8259766cf036cd113d0b26237eaaf1c704bfb1290fa2ba3336ef80e6ae93167

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