Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f885856dc6b9ca…

MALICIOUS

PDF

34.9 KB Created: 2021-06-28 13:03:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 4097df68ba74fca38c1fdf99cf6551db SHA-1: d89cfc275484650c7a7c6f0126a09d18b3fe49ac SHA-256: a4f885856dc6b9cac6b3153aea9d3b36bd1be134e3f2870b63026ca57ef127c0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links, including one to a known malicious redirector infrastructure at http://netcdn.co/app/431946152/barren-cheats-roblox-game-hack. The document body and heuristics indicate a lure for game hacks and generators, likely intended to lead users to further malicious content or downloads. No scripts were extracted, but the embedded URLs and redirector findings strongly suggest a phishing or social engineering attack.

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/barren-cheats-roblox-game-hack In PDF document text
    • https://www.stomatoloska-ordinacija-rijeka.com/files/free-printable-roblox-coloring-pages_GM431946152.pdfIn PDF document text
    • https://www.stomatoloska-ordinacija-rijeka.com/files/robux-hack-apk_GM431946152.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.stomatoloska-ordinacija-rijeka.com/files/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • https://www.stomatoloska-ordinacija-rijeka.com/files/coin-master-game-hack_GM406889139.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/minecraft-account-hacked_GM479516143.pdfIn PDF document text
    • https://www.stomatoloska-ordinacija-rijeka.com/files/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/free-roblox-script-builder-scripts_GM431946152.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/how-to-become-a-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/coin-master-free-400-spin-link_GM406889139.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/hack-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/rbxoffers-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://www.stomatoloska-ordinacija-rijeka.com/files/minecraft-for-macbook-free_GM479516143.pdfIn PDF document text
    • https://www.stomatoloska-ordinacija-rijeka.com/files/como-usar-cheat-engine-en-roblox-dragon-ball-rage_GM431946152.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/roblox-hack-item-for-free_GM431946152.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/free-tiktok-likes-app_GM835599320.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/get-robux-for-free-2021_GM431946152.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_off0000316f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x316F 22740 bytes
SHA-256: cc8c5afc1fb0e1a34c8181d94c61c2360ddefc1c26e8a16e740e64c3f8208c2b
font_01_sfnt_off0000645a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x645A 18756 bytes
SHA-256: 54a01108a1c6e8ad0922eaadebde6db82354f9b2fc74a7286cee47a27d11f3fa

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