Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a9ccd55bdd113f3…

MALICIOUS

PDF

54.3 KB Created: 2021-05-17 00:01:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d55400f8a39e02835d3201aabc6d37ec SHA-1: 837c8c9dc6a50733f0ebcd8f505fae76bc06790b SHA-256: 8a9ccd55bdd113f36942bc6b486dcf85a7ad4ee9071cb847d485026fdbb995a5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains multiple links that redirect to malicious infrastructure, specifically promoting 'Coin Master Hack Spins Free'. The ML classifier also flagged this PDF as malicious. The presence of a download button lure further supports the malicious intent of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8602

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/coin-master-hack-spins-free-game-hack In PDF document text
    • http://maestriadental.com/images/coin-master-free-spins-link-2021-april_GM406889139.pdfIn PDF document text
    • http://maestriadental.com/images/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://maestriadental.com/images/http-coin-master-hack-club_GM406889139.pdfIn PDF document text
    • http://maestriadental.com/images/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • http://maestriadental.com/images/coin-master-20-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://maestriadental.com/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://maestriadental.com/images/moonactive-coin-master_GM406889139.pdfIn PDF document text
    • http://maestriadental.com/images/coin-master-free-spins-apple_GM406889139.pdfIn PDF document text
    • http://maestriadental.com/images/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://maestriadental.com/images/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • http://maestriadental.com/images/claim-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://maestriadental.com/images/free-roblox-gear_GM431946152.pdfIn PDF document text
    • http://maestriadental.com/images/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • http://maestriadental.com/images/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://maestriadental.com/images/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://maestriadental.com/images/coin-master-guide-to-free-spins-and-rewards_GM406889139.pdfIn PDF document text
    • http://maestriadental.com/images/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • http://maestriadental.com/images/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://maestriadental.com/images/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://maestriadental.com/images/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000048ab.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48AB 26432 bytes
SHA-256: 1728f83aff4623a09601575e369e72177f39907579c705b2113698e9845fcb4b
font_01_sfnt_off000085fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85FE 3088 bytes
SHA-256: e7854aff7cbc8fbdeb85d2b3d6248d12dc820ede8a581f4eac107fa6446c2222
font_02_sfnt_off000090c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90C9 7960 bytes
SHA-256: cf7ae5cf6bef3222f5a26bec705b492fed0278aec6b16ec101aeda46e0edd2b2
font_03_sfnt_off0000a3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA3EE 18056 bytes
SHA-256: 3a48050c63aabf25a2d2ed42cf8c513b78da245fbdfe2ff32403c31c4228eff7
font_04_sfnt_off0000c525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC525 4272 bytes
SHA-256: fac9a06ceb5574feb8580c075df3ef69dfbd0efa4947186cfe90f11b68eaafb0

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