Malicious PDF — malware analysis report

Static analysis result for SHA-256 280f135b28509554…

MALICIOUS

PDF

52.5 KB Created: 2021-06-03 09:54:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 7078193901ea6ae9fab12072e2dad7e8 SHA-1: 093fb7fee072c66821caca3787c8624bce844a4e SHA-256: 280f135b285095542ff724945b5cfddadc36ff11c0fc957416f4a0589b66b262
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector, disguised as game hacks and generators. The document body and heuristics indicate a fake CAPTCHA or human verification prompt is used to trick users into clicking these links. The primary malicious link identified is https://netcdn.online/app/431946152/robloxmatchcom-free-robux-game-hack, which likely leads to further malicious content or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9586

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/431946152/robloxmatchcom-free-robux-game-hack In PDF document text
    • https://lib.unitri.ac.id//repository/will-minecraft-ever-be-free_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/haktuts-coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/minecraft-java-free-trial_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/how-to-change-your-username-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-spins-coin-master-october-17-2021_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/minecraft-java-hacks_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/lazyblocks-com-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/is-minecraft-free-on-mac_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-hack-review_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/roblox-com-www_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-multiplayer-minecraft-server_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-minecraft-website_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-village-4_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-roblox-shirt-templates_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/hack-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-roblox-clothes-boy_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-get-minecraft-java-edition-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_004_off00005118.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5118 27160 bytes
SHA-256: 9cbf34ecebea33f719f70a69374229ee3b2f79636c0b5a9ef7e7ce83a4bf1719
font_01_sfnt_off00008e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E54 8132 bytes
SHA-256: 7b13f62dd83f6e5b39d850f66139f44fff841e4e695f86fdfbe4d5a2de470bf2
font_02_sfnt_off0000a945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA945 18848 bytes
SHA-256: ab697af47372efef3bc892e863fb86233d1822f3405b26a2011cbdc17c8d7041

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