Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff8b2521ec9a5dc…

MALICIOUS

PDF

36.1 KB Created: 2021-07-10 01:05:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 6db37d73a5267a34ca46bc42f8eed686 SHA-1: 6a322f48ee929cd50160ed733edcfae35d2d7015 SHA-256: eff8b2521ec9a5dcc1611f260ffa654ab8dd667447bc4f23e9e24054510c4704
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The primary redirector URL is http://netcdn.tw/app/406889139/coin-master-free-spins-link-download-free-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering attack aimed at tricking users into visiting malicious sites, likely for further malware delivery or credential harvesting.

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-link-download-free-game-hack In PDF document text
    • http://www.b2bonline.ph/uploaded_files/userfiles/files/coin-master-hack-tool-no-survey_GM406889139.pdfIn PDF document text
    • http://www.b2bonline.ph/uploaded_files/userfiles/files/roblox-bux-free_GM431946152.pdfIn PDF document text
    • http://www.b2bonline.ph/uploaded_files/userfiles/files/hero-havoc-hack-pastebin-roblox_GM431946152.pdfIn PDF document text
    • http://www.b2bonline.ph/uploaded_files/userfiles/files/dll-files-for-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.b2bonline.ph/uploaded_files/userfiles/files/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://www.b2bonline.ph/uploaded_files/userfiles/files/free-exploits-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.b2bonline.ph/uploaded_files/userfiles/files/coin-master-free-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://www.b2bonline.ph/uploaded_files/userfiles/files/free-roblox-items-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.b2bonline.ph/uploaded_files/userfiles/files/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.b2bonline.ph/uploaded_files/userfiles/files/microsoft-store-robux_GM431946152.pdfIn PDF document text
    • http://www.b2bonline.ph/uploaded_files/userfiles/files/coin-master-hack-355_GM406889139.pdfIn PDF document text
    • http://www.b2bonline.ph/uploaded_files/userfiles/files/free-roblox-account-website_GM431946152.pdfIn PDF document text
    • http://www.b2bonline.ph/uploaded_files/userfiles/files/free-robux-for-ipod_GM431946152.pdfIn PDF document text
    • http://www.b2bonline.ph/uploaded_files/userfiles/files/how-to-make-your-own-roblox-clothes-for-free_GM431946152.pdfIn PDF document text
    • http://www.b2bonline.ph/uploaded_files/userfiles/files/free-script-executor-roblox_GM431946152.pdfIn PDF document text
    • http://www.b2bonline.ph/uploaded_files/userfiles/files/free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://www.b2bonline.ph/uploaded_files/userfiles/files/roblox-games-that-actually-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.b2bonline.ph/uploaded_files/userfiles/files/what-is-coin-master_GM406889139.pdfIn PDF document text
    • http://www.b2bonline.ph/uploaded_files/userfiles/files/beastmode-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.b2bonline.ph/uploaded_files/userfiles/files/free-roblox-generator-for-roblox_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000035f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35F6 22644 bytes
SHA-256: 0a170084e12667e63383b6a8f81ec7e5c497ce00b94e53d20c95e4fb30b1c7bb
font_01_sfnt_off000068bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68BF 18924 bytes
SHA-256: a4bb17e2b546a4d7fe34b124958f87fb40140c6e90ac4756c30edd8d3bfebad3

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