Malicious PDF — malware analysis report

Static analysis result for SHA-256 551652bbc387dea5…

MALICIOUS

PDF

35.2 KB Created: 2021-07-05 18:54:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b1a4e1109b2a9ce8121b2ecb8e0ffdcc SHA-1: 8fb70ed6035f9b93af098a7c386ee2c3e05159fb SHA-256: 551652bbc387dea5a2508bb8de09f9d45da9e5d7eed312a25dea3f0c9c413309
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to websites offering free Robux and game hacks, which is a common lure for phishing and scam operations. The primary redirector URL, http://netcdn.tw/app/431946152/robux-free-gift-card-org-hack-game-hack, is flagged as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering attack 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/robux-free-gift-card-org-hack-game-hack In PDF document text
    • http://mtsn2ende.com/__statics/gudangsoal/files/roblox-royale-high-cheats-for-diamonds-2021-hack_GM431946152.pdfIn PDF document text
    • http://mtsn2ende.com/__statics/gudangsoal/files/free-robux-com_GM431946152.pdfIn PDF document text
    • http://mtsn2ende.com/__statics/gudangsoal/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://mtsn2ende.com/__statics/gudangsoal/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://mtsn2ende.com/__statics/gudangsoal/files/free-robux-no-download-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://mtsn2ende.com/__statics/gudangsoal/files/free-roblox-shirt-templates-2021-christmas_GM431946152.pdfIn PDF document text
    • http://mtsn2ende.com/__statics/gudangsoal/files/comment-avoir-des-robux-gratuit-2021-sur-pc-hack_GM431946152.pdfIn PDF document text
    • http://mtsn2ende.com/__statics/gudangsoal/files/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • http://mtsn2ende.com/__statics/gudangsoal/files/free-fortnite-dances-roblox_GM431946152.pdfIn PDF document text
    • http://mtsn2ende.com/__statics/gudangsoal/files/coin-master-free-spin-facebook-link_GM406889139.pdfIn PDF document text
    • http://mtsn2ende.com/__statics/gudangsoal/files/free-roblox-executor-no-key_GM431946152.pdfIn PDF document text
    • http://mtsn2ende.com/__statics/gudangsoal/files/rbxfree-com-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://mtsn2ende.com/__statics/gudangsoal/files/free-robux-codes-28_GM431946152.pdfIn PDF document text
    • http://mtsn2ende.com/__statics/gudangsoal/files/how-to-get-minecraft-on-chromebook-for-free_GM479516143.pdfIn PDF document text
    • http://mtsn2ende.com/__statics/gudangsoal/files/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://mtsn2ende.com/__statics/gudangsoal/files/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://mtsn2ende.com/__statics/gudangsoal/files/free-gift-card-gewnorater-for-robux_GM431946152.pdfIn PDF document text
    • http://mtsn2ende.com/__statics/gudangsoal/files/cheat-menu-roblox_GM431946152.pdfIn PDF document text
    • http://mtsn2ende.com/__statics/gudangsoal/files/roblox-cc-hacks_GM431946152.pdfIn PDF document text
    • http://mtsn2ende.com/__statics/gudangsoal/files/roblox-hack-unlimited-robux_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_off00003049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3049 22908 bytes
SHA-256: 7066fb49be387ce60fcbc3e3b895453f8a81cd08d2b8048da75d8c0c0127e1b9
font_01_sfnt_off000063ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63AB 19284 bytes
SHA-256: f1156f7356268fb459af4e8b8e1a15365edbfdc259dc3c2b8efbc825fbef6ec1

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