Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b90af8e7a40e190…

MALICIOUS

PDF

47.4 KB Created: 2021-06-08 23:57:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3e80cfb49547b1866dfbb312184793b7 SHA-1: c31d9f7b9a2a7a78321e0ef24e263a32a17d1039 SHA-256: 6b90af8e7a40e1902b90a090c4cce8ea8449f1615223edeb1eca0cad35e59c21
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for a malicious redirector link, specifically a 'free generator / game hack' lure. The document body, though heavily obfuscated, contains references to 'Nouveau Hack Robux' and a URL that aligns with the heuristic findings. This suggests the primary purpose is to trick users into visiting malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.tw/app/431946152/nouveau-hack-robux-game-hack In PDF document text
    • https://repository.umgo.ac.id/repository/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/roblox-cp_GM431946152.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/lots-of-robux_GM431946152.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/win-free-robux_GM431946152.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/minecraft-java-hacks_GM479516143.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/get-free-clotyhes-pon-roblox_GM431946152.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/free-minecraft-account-and-password-generator_GM479516143.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/free-exploits-for-roblox_GM431946152.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/roblox-games-to-play-for-free_GM431946152.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/pokemon-go-free-no-download_GM1094591345.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://repository.umgo.ac.id/repository/freerobuxhack-us-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
font_00_sfnt_off00005199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5199 25288 bytes
SHA-256: 97a7c3cc9d1b73197039dfa4f815ef6e56fe4a0aef0f170de072bc4ada24db83
font_01_sfnt_off00008bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BCF 2984 bytes
SHA-256: a041269937b9d3d35cf152722326a211c577d4d79226aae04184c2281e8f6072
font_02_sfnt_off00009623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9623 18360 bytes
SHA-256: c7a48bbb8512954685ec8522ce9fa135be98a501c243a6bc58167e8bc8e1b05e

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