Malicious PDF — malware analysis report

Static analysis result for SHA-256 68d27fba224d0a77…

MALICIOUS

PDF

44.1 KB Created: 2021-06-03 15:33:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1692a8e5951826144d94889293903028 SHA-1: c87f2e6b8767e1ca423edeef9e9aabea846e4a75 SHA-256: 68d27fba224d0a7795dd237c795e4dd28fc378f405250ee75bc26226995d0018
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to malicious infrastructure. The document body, though heavily obfuscated, contains text related to 'Coin Master' and a URL that matches the heuristic. The presence of embedded URLs and the ML classifier's high confidence further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/coin-master-latest-version-hack-game-hack In PDF document text
    • https://www.themerchantshouse.co.uk/uploads/files/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://www.themerchantshouse.co.uk/uploads/files/files/free-spins-generated-from-coin-master_GM406889139.pdfIn PDF document text
    • https://www.themerchantshouse.co.uk/uploads/files/files/what-do-roblox-points-do_GM431946152.pdfIn PDF document text
    • https://www.themerchantshouse.co.uk/uploads/files/files/how-to-download-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • https://www.themerchantshouse.co.uk/uploads/files/files/robux-scam_GM431946152.pdfIn PDF document text
    • https://www.themerchantshouse.co.uk/uploads/files/files/coin-master-34-6-hack_GM406889139.pdfIn PDF document text
    • https://www.themerchantshouse.co.uk/uploads/files/files/free-robux-download_GM431946152.pdfIn PDF document text
    • https://www.themerchantshouse.co.uk/uploads/files/files/coin-master-hack-apk-android-1_GM406889139.pdfIn PDF document text
    • https://www.themerchantshouse.co.uk/uploads/files/files/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • https://www.themerchantshouse.co.uk/uploads/files/files/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • https://www.themerchantshouse.co.uk/uploads/files/files/minecraft-112-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.themerchantshouse.co.uk/uploads/files/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.themerchantshouse.co.uk/uploads/files/files/free-robux-clothes_GM431946152.pdfIn PDF document text
    • https://www.themerchantshouse.co.uk/uploads/files/files/coin-master-links-to-free-spins_GM406889139.pdfIn PDF document text
    • https://www.themerchantshouse.co.uk/uploads/files/files/coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.themerchantshouse.co.uk/uploads/files/files/get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.themerchantshouse.co.uk/uploads/files/files/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • https://www.themerchantshouse.co.uk/uploads/files/files/coin-master-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • https://www.themerchantshouse.co.uk/uploads/files/files/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.themerchantshouse.co.uk/uploads/files/files/free-spins-coin-master-daily_GM406889139.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_004_off00005124.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5124 24980 bytes
SHA-256: fcafdc6ff86c5551bc5dcc75bfe3c7d079d65c993df6f40f74a53d509f542305
font_01_sfnt_off00008aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AEB 17848 bytes
SHA-256: e6a541bb9d0fa392ff7c4dd8c6fe04cfd1564a102b60f3b8f3e9956a20f70d19

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