Malicious PDF — malware analysis report

Static analysis result for SHA-256 dea681d0c2c24d17…

MALICIOUS

PDF

43.0 KB Created: 2021-06-03 07:43:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 098391696a9d112fc8996733ee1b15af SHA-1: ec124612c4a9a3db56021e74ade6e6ac21d9d68b SHA-256: dea681d0c2c24d17352c2dc4430744a47d282952506a84fca6d7c71e9ab667c4
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a fake CAPTCHA lure and multiple links to redirector domains, aiming to trick users into downloading further malicious content. The primary redirector URL is https://netcdn.online/app/406889139/coin-master-free-spin-whatsapp-group-link-game-hack, which is associated with known malicious infrastructure. The document's structure and embedded links suggest it is part of a phishing campaign designed to deliver malware or lead users to scam websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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/406889139/coin-master-free-spin-whatsapp-group-link-game-hack In PDF document text
    • http://samavetpharm.com/userfiles/files/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/free-views-tiktok_GM835599320.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/how-to-get-free-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/minecraft-classic-free_GM479516143.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/how-to-get-free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/roblox-piano-hack_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/get-free-cards-coin-master_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/hack-coin-master-without-root_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/how-to-get-stuff-that-cost-coins-free-mpe-master_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/master-hack-coin_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/free-group-roblox_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/roblox-games-com-free_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/toolbox-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/how-to-get-free-hair-in-roblox_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/robux-cheat_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/free-roblox-accounts-with-robux-that-work-2021_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_004_off0000507a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x507A 23208 bytes
SHA-256: df2ff8e8a74bdcc811c02cff1423f8c9c472c3eb3009fd81c916bfedcafd6c6d
font_01_sfnt_off000084c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84C5 18560 bytes
SHA-256: c65993a8877690b51d5778b5551e0b245465244fc3a88f38fe2d5d44dfc47c4d

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