Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb404dec91455d2…

MALICIOUS

PDF

35.7 KB Created: 2021-07-07 06:17:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 278141e33ec446860781c7356ae09108 SHA-1: 0edc6a17c213a13e079a50a4e423d81a41637fef SHA-256: ffb404dec91455d2e844ec2eacf1933c293159383bcd5cf69f3d3ad5374be6d8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising game hacks and generators. The primary lure URL is http://netcdn.tw/app/406889139/how-to-get-free-spins-for-coin-master-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a social engineering attack designed to lead users to potentially malicious content or further downloads.

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/how-to-get-free-spins-for-coin-master-game-hack In PDF document text
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/best-hack-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/roblox-my-girlfriend-cheated-on-me-meme_GM431946152.pdfIn PDF document text
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/roblox-hack-apk-mod-menu_GM431946152.pdfIn PDF document text
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/ultimate-driving-hack-roblox_GM431946152.pdfIn PDF document text
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/roblox-us-hack_GM431946152.pdfIn PDF document text
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/roblox-lovenet_GM431946152.pdfIn PDF document text
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/games-like-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/free-photosmasher-roblox_GM431946152.pdfIn PDF document text
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/free-generator_GM431946152.pdfIn PDF document text
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/how-to-get-roblox-money-cheat_GM431946152.pdfIn PDF document text
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/free-spin-card-exchange-coin-master_GM406889139.pdfIn PDF document text
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/robux-generator-that-works_GM431946152.pdfIn PDF document text
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/how-to-hack-coin-master-with-game-guardian_GM406889139.pdfIn PDF document text
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/teach-me-to-hack_GM431946152.pdfIn PDF document text
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/camiseta-de-hacker-de-roblox_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
stream_002_off00003417.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3417 23388 bytes
SHA-256: 401dca3b13bbc2a37d92c37a9a4a6d4dd3041f0a6950d12c9f53f24e38a8d87e
font_01_sfnt_off000068d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68D1 18336 bytes
SHA-256: 23f71a9ba4d854b783c042dde3b810d75211435ebb04f16eb6963276a01a3aa2

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