Malicious PDF — malware analysis report

Static analysis result for SHA-256 196e2d4b3897f67f…

MALICIOUS

PDF

32.9 KB Created: 2021-07-01 10:21:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b1f689631bcb6e2905211aeb075279e6 SHA-1: ac1c7c948d5380849f59a956a0b864d5ab37415d SHA-256: 196e2d4b3897f67f94877a42e0ebb1af6b99e1d9444f36cc2aa545ef74b240c3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links, including one identified as a malicious redirector. The document body explicitly mentions 'Free Robux Working No Human Verification' and provides a direct link to a generator, indicating a scam or phishing attempt. The presence of multiple related PDF files hosted on the same domain suggests a coordinated campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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-working-no-human-verification-game-hack In PDF document text
    • https://nature-air.com.tw/upload/files/pubg-uc-icon_GM1330123889.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/robux-cheat_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/hacking-robux-for-money_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-robuxrblx-file_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-roblox-exploits_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/is-minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/how-to-hack-adopt-me-roblox_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-robux-real_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/coin-master-game-hacking_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/como-hacer-hacker-en-roblox_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-robux-with-developer-tools_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/minecraft-download-free-download_GM479516143.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/roblox-hacker-look_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/roblox-free-dragon-ball-z-map_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-coin-master-spins-daily_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_off000029da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29DA 21816 bytes
SHA-256: 3b8baa4496624e5399765fb207e251888f7e32986e86fc3c58625425e5df29b0
font_01_sfnt_off000059fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59FA 19704 bytes
SHA-256: f312d5b84a0a4ebfe6ed6e03f108c07428375fe0cb59c16aca41d6e00279b2fe

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