Malicious PDF — malware analysis report

Static analysis result for SHA-256 da11af0ed9ab8661…

MALICIOUS

PDF

35.4 KB Created: 2021-06-18 15:50:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1283c503c7ba11e554817b441c61df8a SHA-1: c36c7209ddbdfd6db6d15ffcebce1c6b41a1b2f2 SHA-256: da11af0ed9ab8661ba2f4d3924f49d887b77102f52df9da111f4c3c8c745d2ae
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for free game currency ('Free Robux') and directs users to a URL that is flagged as a malicious redirector. The document body and heuristics indicate a social engineering tactic to trick users into visiting potentially harmful websites. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/free-robux-read-desc-game-hack In PDF document text
    • https://www.sarsen.net/uploads/files/files/easy-robux-today-com_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-pet-food-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/coin-master-hack-download-2021_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/minecraft-free-download-iphone_GM479516143.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/how-to-hack-your-friends-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-minecraft-server-hosting-24-7_GM479516143.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/how-to-get-wings-for-free-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/robux-download_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-spin-today-coin-master_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/coin-master-hacks-for-free-spins_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-spins-and-coins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/getrobux-info_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/kuso-icu-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/best-script-for-slx-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.roblox.com/.IIn 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_off00003457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3457 22136 bytes
SHA-256: 8c75c6253a1f4012f3810f95eb3c97b27a6832d59c47b9bd7146c1dec4702976
font_01_sfnt_off00006553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6553 19060 bytes
SHA-256: db50f33a3353564e0d3d5f1251704fea5de5fd6ea358e952ebff1c99cc9de8d6