Malicious PDF — malware analysis report

Static analysis result for SHA-256 091c90806ccafbef…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 19:24:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 57efbd0b156797c3a06168a2acc79c0e SHA-1: 6b1274e75bf1395653a5b497b92b9cd934cd3a28 SHA-256: 091c90806ccafbefb515ec753ba3edd994ce2e4c5a3cbb12a5253d045024e008
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 a known malicious redirector infrastructure. The document body and embedded URLs reinforce this by advertising 'Coin Master Hack' and related game cheats, directing users to the malicious URL. No scripts were extracted, but the primary attack vector is a deceptive link designed to trick users into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-hack-facebook-game-hack In PDF document text
    • https://opac.heritagejkt.org//repository/how-to-get-free-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/project-delta-roblox-cheats_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/roblox-free-pants_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/coin-master-gold-cards-hack-2021_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/how-to-hack-to-get-roblox-money-easy-way_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/su-tart-sad-story-free-mod-roblox_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/roblox-avatar-hack_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/free-robux-generator_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-hacking-news_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/code-triche-roblox-robux-free_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-robux-space_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/how-to-get-free-robux-hack-pc_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_002_off000031dd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31DD 23172 bytes
SHA-256: a8b3ed5ff41a59936a58b3ad890727d48194fdd84ef0af571693e96e7a51073a
font_01_sfnt_off000065d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65D8 18324 bytes
SHA-256: bb32a85166deec1bc0413a6c3f4f2e8134ce2f48ae2a06b801584c615e44360d

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