Malicious PDF — malware analysis report

Static analysis result for SHA-256 36bcd1ab9f70c7f0…

MALICIOUS

PDF

41.8 KB Created: 2021-05-12 23:01:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9151ac4925e41f95d74528835fafa5d9 SHA-1: af72824fd4369b3af4b7d9fb185778533a2fef31 SHA-256: 36bcd1ab9f70c7f092b2cac206ee160c2b08a4cff924c373fe8a01f359daba2a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lead to known malicious redirector infrastructure, specifically promoting "free generator / game hack" lures. The document body and heuristics indicate a social engineering attempt to trick the user into visiting these malicious URLs. No scripts were extracted, but the presence of malicious links and the ML classifier output strongly suggest a malicious intent.

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/earn-free-spins-in-coin-master-game-hack In PDF document text
    • http://sarny-rada.org/ckfinder/userfiles/files/coin-master-unlimited-spin-apk-free-download_GM406889139.pdfIn PDF document text
    • http://sarny-rada.org/ckfinder/userfiles/files/unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • http://sarny-rada.org/ckfinder/userfiles/files/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • http://sarny-rada.org/ckfinder/userfiles/files/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://sarny-rada.org/ckfinder/userfiles/files/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://sarny-rada.org/ckfinder/userfiles/files/free-robux-generator-codes_GM431946152.pdfIn PDF document text
    • http://sarny-rada.org/ckfinder/userfiles/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://sarny-rada.org/ckfinder/userfiles/files/free-spin-links-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://sarny-rada.org/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-xbox_GM479516143.pdfIn PDF document text
    • http://sarny-rada.org/ckfinder/userfiles/files/coin-master-free-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • http://sarny-rada.org/ckfinder/userfiles/files/best-free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://sarny-rada.org/ckfinder/userfiles/files/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://sarny-rada.org/ckfinder/userfiles/files/coin-master-free-spins-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://sarny-rada.org/ckfinder/userfiles/files/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
    • http://sarny-rada.org/ckfinder/userfiles/files/coin-master-hack-pc-download_GM406889139.pdfIn PDF document text
    • http://sarny-rada.org/ckfinder/userfiles/files/como-hackear-coin-master-espaol_GM406889139.pdfIn PDF document text
    • http://sarny-rada.org/ckfinder/userfiles/files/coin-master-hack-2021-android-apk_GM406889139.pdfIn PDF document text
    • http://sarny-rada.org/ckfinder/userfiles/files/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://sarny-rada.org/ckfinder/userfiles/files/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://sarny-rada.org/ckfinder/userfiles/files/how-to-get-free-robux-on-ipad_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_off00004a87.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A87 24652 bytes
SHA-256: 8d79414d79d416ce33cf025d8f758e1ca4b4449fc2eb4f0d20e03056c283fb65
font_01_sfnt_off00008242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8242 17884 bytes
SHA-256: c27ada76ada0ec2a2d4f0dfd6bc904cd28eddfde4ea8d230e478e22202e815c5

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