Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c4d9224e9b1d5d…

MALICIOUS

PDF

42.9 KB Created: 2021-05-14 13:09:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 4d753f523ae024f2ce1dcad273246679 SHA-1: 59a8c3d8a65184b68c9ecb4a06323078b671ee78 SHA-256: 78c4d9224e9b1d5dabf8202e3048a5806cdbbee6e5e96c2181e62ef6660f403a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The document body and extracted URLs strongly suggest a phishing or scam attempt designed to trick users into visiting malicious sites. No scripts were extracted, but the PDF's structure and embedded links are indicative of a malicious redirector chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/406889139/free-spin-link-coin-master-game-hack In PDF document text
    • http://yowunpiyasa.lk/images/coin-master-hack-tool-download_GM406889139.pdfIn PDF document text
    • http://yowunpiyasa.lk/images/coin-master-game-free-download-for-pc_GM406889139.pdfIn PDF document text
    • http://yowunpiyasa.lk/images/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://yowunpiyasa.lk/images/free-minecraft-hosting_GM479516143.pdfIn PDF document text
    • http://yowunpiyasa.lk/images/coin-master-tricks_GM406889139.pdfIn PDF document text
    • http://yowunpiyasa.lk/images/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://yowunpiyasa.lk/images/google-play-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://yowunpiyasa.lk/images/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://yowunpiyasa.lk/images/rewards-robux_GM431946152.pdfIn PDF document text
    • http://yowunpiyasa.lk/images/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://yowunpiyasa.lk/images/how-to-get-free-chest-in-coin-master_GM406889139.pdfIn PDF document text
    • http://yowunpiyasa.lk/images/coin-master-link-spin_GM406889139.pdfIn PDF document text
    • http://yowunpiyasa.lk/images/collect-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://yowunpiyasa.lk/images/coin-master-daily-spin-link_GM406889139.pdfIn PDF document text
    • http://yowunpiyasa.lk/images/minecraft-bedrock-edition-download-pc-free_GM479516143.pdfIn PDF document text
    • http://yowunpiyasa.lk/images/get-free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://yowunpiyasa.lk/images/free-robux-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • http://yowunpiyasa.lk/images/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://yowunpiyasa.lk/images/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://yowunpiyasa.lk/images/free-robux-without-human-verification_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_003_off00004b01.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B01 24400 bytes
SHA-256: ba44454fa49dc5db0091bcb819e9cfb5ace46d69ec6b1bcf65f110a4cdebe733
font_01_sfnt_off00008206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8206 19384 bytes
SHA-256: a0a8e3a784ca8246e0884639badb25e58b9ad76693196596e8b5a56bc7c8a7a9

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