Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a7f3aa5a0ebd87e…

MALICIOUS

PDF

47.5 KB Created: 2021-06-03 06:25:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 542a47e091123db2eb4bb2cb5a813ed2 SHA-1: 9e0db7754a4096ad144cb5b34746dd98ffe33755 SHA-256: 8a7f3aa5a0ebd87e319d3d3d665ba4fb65f50e9ff430bce03da8a284937ad2e6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, masquerading as game hacks and generators. The primary lure is for 'free spins on Coin Master', directing users to a known malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a phishing or social engineering attack aimed at driving traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.online/app/406889139/free-spins-on-coin-master-2021-ios-game-hack In PDF document text
    • https://razredna-nastava.net/files/how-to-get-free-cards-sets-for-coin-master_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-unlimited-spins-hack_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/are-robux-generators-safe_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/pubg-uc-zarna_GM1330123889.pdfIn PDF document text
    • http://razredna-nastava.net/files/how-to-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/pubg-uc-myanmar_GM1330123889.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-exe_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-minecraft-accounts-reddit_GM479516143.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-back-accessories-roblox_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-free-spins-and-chips_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-free-spins-moonactive_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-game-free-download-for-pc_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/where-to-get-robux_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050d6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50D6 25328 bytes
SHA-256: d5cc0c5ccb2c80e28bbdbc69ff54329ab1f116ec6f35e6e65d0fe815995e35c8
font_01_sfnt_off00008aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AEF 3380 bytes
SHA-256: 1dd933c112880b232546f3aab6a17784a8f412d39fd551cc6eb31c5a04c3ce57
font_02_sfnt_off000096d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96D8 18288 bytes
SHA-256: 9fe1374c2a5f04ab05412f91fd2327b7ecdc71e8abb7b76c0a33ea1eb285afe1

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