Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4e7d852408d396…

MALICIOUS

PDF

50.9 KB Created: 2021-06-07 00:24:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 830b23ed7a660bb143b2d8b7eaff2f65 SHA-1: 9bf3d24e1f6c7d0f199b5252cfd7bf7bec344e38 SHA-256: 8e4e7d852408d39602d63bd738eed1ad384c4eae7c90dd60eeb2c592e93b9cd1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with promises of game hacks and free in-game currency. The primary link directs to 'https://netcdn.tw/app/431946152/how-to-have-bc-free-roblox-2021-game-hack', which is associated with malicious redirector infrastructure. The document body and embedded URLs reinforce this theme, suggesting the intent is to drive traffic to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9744

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.tw/app/431946152/how-to-have-bc-free-roblox-2021-game-hack In PDF document text
    • http://cosver.eu/images/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/roblox-adopt-me-free-pets_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/coin-master-mod-apk-2021_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/free-roblox-usernames-and-passwords_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/free-tiktok-likes-generator_GM835599320.pdfIn PDF document text
    • http://cosver.eu/images/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/free-draw-2-roblox_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/pubg-uc-telegram_GM1330123889.pdfIn PDF document text
    • http://cosver.eu/images/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/wurst-hacks_GM479516143.pdfIn PDF document text
    • http://cosver.eu/images/coin-master-70-spin-link_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • http://cosver.eu/images/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/roblox-room-cheat-codes_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/how-to-get-minecraft-for-free-on-ipad_GM479516143.pdfIn PDF document text
    • https://rblx.landIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050df.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50DF 29956 bytes
SHA-256: 059a39bc2f486eb4d501762fac4b5bd31359efe36b3787ae388317160ebfc39b
font_01_sfnt_off00009555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9555 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off0000a267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA267 18856 bytes
SHA-256: 003d0030550dd712e027dc5d4b2aa08d40e3d9574893d2e69b1429683f0faf89

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