Malicious PDF — malware analysis report

Static analysis result for SHA-256 71abfe68c1826ec2…

MALICIOUS

PDF

33.7 KB Created: 2021-06-25 12:51:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 7b3d7b69144d70de0fd0b7b3d7a72ab6 SHA-1: 70ec70a1368ed92ccdc3455b915d1f0d77e3eaee SHA-256: 71abfe68c1826ec241618379a4aa6a500283efd33b132b313e4657de96e6ce69
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors, specifically advertising 'game hacks' and 'free generators' for popular games. The primary redirector URL is http://netcdn.co/app/431946152/code-hack-robux-pastebin-game-hack, which likely serves as a gateway to further malicious content or phishing pages. The ML classifier also strongly indicated maliciousness.

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/code-hack-robux-pastebin-game-hack In PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/assassin-roblox-hack-aimbot_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-model-scanner-roblox_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/coin-master-hack-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-roblox-website_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-roblox-stuff-catalog_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-robux-site_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/coin-master-free-spin-software_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/roblox-2021-hack_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/minecraft-hacks-xbox-one_GM479516143.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/assassin-cheats-roblox_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/how-to-get-roblox-free-clothes_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/roblox-boku-no-roblox-remastered-hack_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/pubg-uc-generator-without-verification_GM1330123889.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/roblox-premium-free_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/coinmaster-links_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/how-to-hack-any-game-on-roblox-with-cheat-engine_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_off00002de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DE1 21836 bytes
SHA-256: fa195de092fdf2eca671441b070c77007ee3278e958293e81416eef313c3f967
font_01_sfnt_off00005dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DEE 19276 bytes
SHA-256: 5ece72f028cb20423c4e1260b91d6a84f2a691dd446795773df890c2aef7cbf9

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