Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39883f68eadb415…

MALICIOUS

PDF

43.9 KB Created: 2021-06-03 06:33:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 04e8ac6b4a7a17a22e5816876837846a SHA-1: 24a638f40afe46512dc4e61d38164e07b7a6015c SHA-256: b39883f68eadb4155f0617d2671498ef8924c41c99a02d6eff81f23c890592c0
160 Risk Score

Malware Insights

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

The PDF contains multiple links to redirector domains, specifically advertising 'game hacks' and 'generators' for popular games like Roblox. The primary redirector URL, https://netcdn.online/app/431946152/avatar-the-last-airbender-roblox-game-hack, is flagged as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a lure to download further malicious content or engage in phishing, aligning with common social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/431946152/avatar-the-last-airbender-roblox-game-hack In PDF document text
    • https://vierabyragazze.com/upload/files/how-to-get-free-tiktok-coins_GM835599320.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/toolbox-for-mcpe_GM479516143.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/wurst-minecraft_GM479516143.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-robux-co_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/best-way-to-get-robux_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-free-link_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-roblox-followers-generator_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/wurst-download_GM479516143.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-rare-cards-for-coin-master-christmas_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-link-for-spins_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/gamehunters-club-coin-master_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-change-your-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-make-a-minecraft-bedrock-server-for-free_GM479516143.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-tips_GM406889139.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004e08.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E08 24980 bytes
SHA-256: ba844e45940e221012084e8be118f7f160e00f3aee1e9b612714b03f654a3743
font_01_sfnt_off0000876d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x876D 18692 bytes
SHA-256: f66b47eed37cd3b132d5bde49a39db92434aeefb3a2333eebc70f5590a2134f1

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