Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f9133941ccab6d…

MALICIOUS

PDF

34.6 KB Created: 2021-07-04 05:15:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 386f770fece1e82b8213058cbf79dba7 SHA-1: 8c5ce2ddc171f01f9afb0d3aa3ad44fefc5f93fa SHA-256: 41f9133941ccab6d6fc027daf2a207d3259bb3cfe01f983421bce653207b8933
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to game hacks and generators, directing users to a known malicious redirector. The embedded URL, http://netcdn.tw/app/431946152/is-roblox-studio-free-game-hack, is a primary indicator of malicious intent. While no scripts were extracted, the PDF structure and linked URLs strongly suggest a phishing or scam campaign aimed at tricking users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/is-roblox-studio-free-game-hack In PDF document text
    • https://dolphintour.vn/images/uploadsfiles/roblox-robux-code-generator-download-free-no-human-verification_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/pubg-uc-980_GM1330123889.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/how-to-hack-roblox-accounts-passwords_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/how-to-get-minecraft-for-free-on-ps4_GM479516143.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-usernames-and-passwords-roblox_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/roblox-lion-roleplay-cheats_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/calling-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/how-to-hack-roblox-on-macbook-pro_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/proxo-roblox-hack-download_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/roblox-jailbreak-money-hack-2021_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-minecraft-for-kids_GM479516143.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/hack-roblox-prison-miner_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-minecraft-generator_GM479516143.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/cheats-roblox-get-free-robux_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/coin-master-game-android-free-download_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-robux-2021-no-human-verification_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
font_00_sfnt_off00003009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3009 22356 bytes
SHA-256: 7a5120750c0993894bbd15cc4564f6320ad5d12a3d5b7d4093c6c665ccd07b03
font_01_sfnt_off000061a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61A6 19188 bytes
SHA-256: 5b1de23626d81aaf99a279195b00efdf905ea81811442041bbbefcdac3d0aa36

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