Malicious PDF — malware analysis report

Static analysis result for SHA-256 b052d51d943a3cdf…

MALICIOUS

PDF

35.7 KB Created: 2021-07-03 13:30:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 6a9355880a3aecbdfcea9698420c8c95 SHA-1: 7d7f9c57e34ba9bd072d19dc1e67c50c7ec7217d SHA-256: b052d51d943a3cdf289ca1d7d0d2e8e2a3c48d15337effde649ac86c2c6e9579
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure at http://netcdn.tw/app/406889139/coin-master-free-spins-hack-but-no-surveys-game-hack. The document body and extracted URLs suggest a lure for game-related cheats or hacks, a common tactic for distributing malware. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

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.tw/app/406889139/coin-master-free-spins-hack-but-no-surveys-game-hack In PDF document text
    • https://www.atrax.hr/files/free-roblox-noclip-exploit_GM431946152.pdfIn PDF document text
    • http://atrax.hr/files/coin-master-free-spin-download_GM406889139.pdfIn PDF document text
    • http://atrax.hr/files/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.atrax.hr/files/how-to-download-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • https://www.atrax.hr/files/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://atrax.hr/files/pokemon-go-free-quest_GM1094591345.pdfIn PDF document text
    • https://www.atrax.hr/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://atrax.hr/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://atrax.hr/files/roblox-nike-free-auttaucollant_GM431946152.pdfIn PDF document text
    • http://atrax.hr/files/free-sky-slayer-for-roblox_GM431946152.pdfIn PDF document text
    • https://www.atrax.hr/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://atrax.hr/files/roblox-hack-money-apk_GM431946152.pdfIn PDF document text
    • https://www.atrax.hr/files/get-robux-com_GM431946152.pdfIn PDF document text
    • https://www.atrax.hr/files/coin-master-app-hacks_GM406889139.pdfIn PDF document text
    • https://www.atrax.hr/files/roblox-bloxburg-free-money_GM431946152.pdfIn PDF document text
    • https://www.atrax.hr/files/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.atrax.hr/files/coin-master-hack-1021_GM406889139.pdfIn PDF document text
    • https://www.atrax.hr/files/hack-roblox-troll-gui-synapse_GM431946152.pdfIn PDF document text
    • https://www.atrax.hr/files/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://atrax.hr/files/money-cheats-for-roblox-vehicle-simulator_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_off00003184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3184 23600 bytes
SHA-256: 88539e725268fdc25044755fbfd98e9e3d3d99292ca921d0dbf72b8c094443ec
font_01_sfnt_off00006706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6706 18992 bytes
SHA-256: 97804845bf467d2aeff7c85d47b4467823aac43885222e40ee61a94876ec16b2

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