Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f4e35acdc714313…

MALICIOUS

PDF

34.2 KB Created: 2021-07-01 16:51:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9619283f5a1220ec2927824669808c15 SHA-1: e6d4d04373192ce72f34591eb87b2413ea87c826 SHA-256: 4f4e35acdc71431394bd5226bdbb15ce95bdead942dad84062581dc8b9fbefcd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple URLs and a call-to-action phrase, strongly suggesting a phishing or social engineering attempt. The primary URL, http://netcdn.co/app/431946152/free-robux-2021-pc-game-hack, is likely intended to deliver a malicious payload. The ML classifier also flagged this PDF as malicious with high confidence.

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-2021-pc-game-hack In PDF document text
    • https://i-tech.ac.id/perpus/repository/watch-tiktok-for-free_GM835599320.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/get-free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/cheat-engine-roblox-not-patched_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/asshurt-roblox-multitool-free_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/how-to-get-free-robux-and-bc-2021_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/robux-free-dowload-generator-torrent_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/robux-computer-hack_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/roblox-afk-cheat_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/roblox-noclip-hack-no-cheat-engine_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/roblox-hack-gui-dll_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/free-abilities-for-twisted-murderer-on-roblox-hack_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/roblox-saber-simulator-hack_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/free-robux-discord_GM431946152.pdfIn PDF document text
    • https://i-tech.ac.id/perpus/repository/roblox-hack-download-android-prison-life_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_off00003022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3022 21864 bytes
SHA-256: 2bad8796c4f43ce78dcb6af1704d64875eca2c57680dd1d028c585b4c5489d32
font_01_sfnt_off00005fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE4 19272 bytes
SHA-256: 76d65d5fe5e08aa7e1c3783895363f59a24a15699196a3f4acc3b35873c825dc

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