Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81f27caea6e6b10…

MALICIOUS

PDF

45.0 KB Created: 2021-05-10 21:03:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: cf4340c510a411c6e74555af4fe20bdb SHA-1: 4362adc9ec3418e2d4ee5a0d716837249a7118d1 SHA-256: f81f27caea6e6b10a264712a7f52d5da3480de728bacda43f6100342140a81e9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'Coin Master Hack PC' and 'free Robux' lures. The primary redirector, https://netcdn.xyz/app/406889139/coin-master-hack-pc-game-hack, is flagged as malicious. The document body, though heavily obfuscated, contains similar URLs, reinforcing the lure-based attack pattern. No scripts were extracted, but the presence of multiple malicious links indicates a high likelihood of further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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-pc-game-hack In PDF document text
    • http://abst-brandschutztechnik.at/images/coin-master-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://abst-brandschutztechnik.at/images/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • http://abst-brandschutztechnik.at/images/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://abst-brandschutztechnik.at/images/roblox-premium-free_GM431946152.pdfIn PDF document text
    • http://abst-brandschutztechnik.at/images/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://abst-brandschutztechnik.at/images/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://abst-brandschutztechnik.at/images/coin-master-apk-hack-35-8_GM406889139.pdfIn PDF document text
    • http://abst-brandschutztechnik.at/images/how-to-hack-coin-master-computer_GM406889139.pdfIn PDF document text
    • http://abst-brandschutztechnik.at/images/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://abst-brandschutztechnik.at/images/get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://abst-brandschutztechnik.at/images/hack-version-of-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • http://abst-brandschutztechnik.at/images/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • http://abst-brandschutztechnik.at/images/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • http://abst-brandschutztechnik.at/images/moon-active_GM406889139.pdfIn PDF document text
    • http://abst-brandschutztechnik.at/images/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://abst-brandschutztechnik.at/images/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://abst-brandschutztechnik.at/images/free-robux_GM431946152.pdfIn PDF document text
    • http://abst-brandschutztechnik.at/images/free-private-minecraft-server_GM479516143.pdfIn PDF document text
    • http://abst-brandschutztechnik.at/images/hack-robux_GM431946152.pdfIn PDF document text
    • http://abst-brandschutztechnik.at/images/how-to-get-java-minecraft-for-free_GM479516143.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a31.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A31 24876 bytes
SHA-256: ae5dc6d76d8c981abdef0963c3ade5de73a5b48ec7281b0b02ee2d8d33af948d
font_01_sfnt_off000083b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83B8 3124 bytes
SHA-256: 9967c6221325a4ff3f7c4336922605f990450164c2eee2df708cc81823c6ec98
font_02_sfnt_off00008e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E97 17868 bytes
SHA-256: 4813da8d3392ee5be528635b0fa067fda57eeb52b921389f98d36b8b85521abf

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