Malicious PDF — malware analysis report

Static analysis result for SHA-256 815b36ce84806e33…

MALICIOUS

PDF

34.7 KB Created: 2021-07-16 06:25:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5adfd4f5a966fb3fdbbef742a2f1d2d9 SHA-1: 828b98ea3eedd98c43f342813e54067108b2f33f SHA-256: 815b36ce84806e33d4787b0f40275fb32933e7251a69c9e068816dd5aac2bd5a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for free Robux, directing users to a known malicious redirector infrastructure at http://netcdn.tw/app/431946152/how-do-you-get-free-robux-on-roblox-game-hack. The document body and embedded URLs suggest a social engineering tactic to trick users into visiting potentially harmful sites. No scripts were extracted, limiting the analysis of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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.tw/app/431946152/how-do-you-get-free-robux-on-roblox-game-hack In PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/how-to-get-hacks-on-roblox-counter-blox-roblox-offensive_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/free-robux-no-offers-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/free-ways-to-record-roblox-with-voice_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/coin-master-hack-online-cheat_GM406889139.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/cheat-engine-roblox-infinite-health_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/20210-robux-promo-code-free_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/coin-master-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/how-to-get-free-robux-crystalsheep_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/free-spins-for-coin-master_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_off00002fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FD9 23088 bytes
SHA-256: 34c1468b474604336a3e511a765e806fe22cc1825fe00af3de950b4660d536fa
font_01_sfnt_off000063ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63EC 18872 bytes
SHA-256: 24fd41772b4527d90362dac6de866a4ab7aa5c30c1e1928212e5c42b76e1fb73