Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78dea49d9b7b3f1…

MALICIOUS

PDF

41.6 KB Created: 2021-05-14 14:09:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 524d3b221628107d8761008e2dc9750f SHA-1: df24b1d64a81474b616027164f5f9fa790ff5059 SHA-256: a78dea49d9b7b3f1de89a5e0ca5f947432a6821238b9067fe3b7dd948a11008b
188 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and links to known malicious redirectors, specifically advertising a 'free generator / game hack'. The primary link, https://netcdn.xyz/app/406889139/free-pet-food-for-coin-master-game-hack, is designed to lure users into clicking, likely leading to further malicious content or exploits. The presence of malformed stream lengths and embedded JS indicates an attempt to exploit PDF viewers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://netcdn.xyz/app/406889139/free-pet-food-for-coin-master-game-hack In PDF document text
    • http://huananhai.net/images/www-rbxhut-com_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-daily-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/roblox-script-hack_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/freespinandcoin-blogspot_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-free-100-spin-link_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/como-hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/robux-free-com_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/free-minecraft-account-list_GM479516143.pdfIn PDF document text
    • http://huananhai.net/images/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-400-spin-link-today_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/free-robux-today_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-32-mod-hack-unlimited_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/minecraft-hack-2021_GM479516143.pdfIn PDF document text
    • http://huananhai.net/images/vip-roblox-free_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/haktuts-coin-master-free-spins-2021_GM406889139.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
stream_003_off00004776.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4776 25196 bytes
SHA-256: bc4aece80c80181ef14dea48e182711141fb99dbcb9b8a96772428a71473858b
font_01_sfnt_off00008118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8118 18040 bytes
SHA-256: 80b08f0f47efeae7474973f213c4bda075b9244837f94a62dadeca22caed91d8

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