Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d7ea5b7595aa6b…

MALICIOUS

PDF

36.0 KB Created: 2021-07-04 09:54:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5d95289c4add3139a810d694281fb2cc SHA-1: e759a3210ae9046122b154cea6da66c379f4517f SHA-256: 16d7ea5b7595aa6bb8d71662d9121dd162deef3a87dc41154e52707298011710
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs, with a primary link to 'netcdn.tw' that promises a Roblox account hack. This lure, combined with the ML classifier's high confidence, indicates a phishing or scam attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious websites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/431946152/how-to-hack-someones-roblox-account-2021-game-hack PDF link annotation
    • https://www.medlinerecruitment.com/uploaded_files/userfiles/files/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • https://www.medlinerecruitment.com/uploaded_files/userfiles/files/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://www.medlinerecruitment.com/uploaded_files/userfiles/files/roblox-hack-robux-apk_GM431946152.pdfIn PDF document text
    • https://www.medlinerecruitment.com/uploaded_files/userfiles/files/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • https://www.medlinerecruitment.com/uploaded_files/userfiles/files/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • https://www.medlinerecruitment.com/uploaded_files/userfiles/files/how-to-get-free-skins-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.medlinerecruitment.com/uploaded_files/userfiles/files/roblox-phantom-force-hacks_GM431946152.pdfIn PDF document text
    • https://www.medlinerecruitment.com/uploaded_files/userfiles/files/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.medlinerecruitment.com/uploaded_files/userfiles/files/how-to-make-a-roblox-group-for-free_GM431946152.pdfIn PDF document text
    • https://www.medlinerecruitment.com/uploaded_files/userfiles/files/roblox-jailbreak-cheat-2021_GM431946152.pdfIn PDF document text
    • https://www.medlinerecruitment.com/uploaded_files/userfiles/files/free-daily-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • https://www.medlinerecruitment.com/uploaded_files/userfiles/files/coin-master-links-2021_GM406889139.pdfIn PDF document text
    • https://www.medlinerecruitment.com/uploaded_files/userfiles/files/how-do-you-get-roblox-money_GM431946152.pdfIn PDF document text
    • https://www.medlinerecruitment.com/uploaded_files/userfiles/files/minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • https://www.medlinerecruitment.com/uploaded_files/userfiles/files/coin-master-com_GM406889139.pdfIn PDF document text
    • https://www.medlinerecruitment.com/uploaded_files/userfiles/files/robux-how-to-make-a-promo-code-hack_GM431946152.pdfIn PDF document text
    • https://www.medlinerecruitment.com/uploaded_files/userfiles/files/roblox-dance-hack_GM431946152.pdfIn PDF document text
    • https://www.medlinerecruitment.com/uploaded_files/userfiles/files/haktuts-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.medlinerecruitment.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • https://www.medlinerecruitment.com/uploaded_files/userfiles/files/static-moonactive-net-free-spins-coin-master_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
font_00_sfnt_off000031e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31E6 23008 bytes
SHA-256: eae1acef91da52ea00326e8ccf7ef13d03cdf2cd05885d92e28cb0b8b414631f
font_01_sfnt_off0000657b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x657B 19724 bytes
SHA-256: f50c412bcfe1d1f98486a75b2c7138549e2bea37deae9173a274dae717afecb9

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