Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a82da7c64129ba0…

MALICIOUS

PDF

34.4 KB Created: 2021-07-05 18:41:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 75e4b2d0d9f70cfe41acc7d428c8e9d1 SHA-1: 853cc5ff55dc4e480220704b72cfeddd744ce732 SHA-256: 5a82da7c64129ba0d0d5409a66c4bcd10ee9816c5a74573ac9fb7ab988fa19b4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that redirect to sites offering "free Robux" or game hacks, a common lure for malicious content. The heuristic firings confirm these links point to known malicious redirectors and a general lure for game hacks. While no scripts were explicitly extracted, the nature of the embedded URLs and the lure suggests the document is designed to lead the user to download further malicious payloads or engage in phishing activities.

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/websites-to-get-free-robux-game-hack In PDF document text
    • http://educhina.mn/editor/files/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/download-roblox-clothes-free-online_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-cheats-for-free-spins_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/roblox-hack-tools-no-virus_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-roblox-gift-card-codes-live-now_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/roblox-free-robux-console_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/how-to-get-free-robux-on-pc-windows-10-2021_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/roblox-hack-2021-may_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/roblox-hack-2021-forum_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-spin-link-in-coin-master-game_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/roblox-arsenal-hacks-download_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-roblox-gift-card_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_off00003027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3027 22120 bytes
SHA-256: 1e7ab941a449a4b6b6b1e7f5f8611bfec455034a3405b83cc7c61b304132f717
font_01_sfnt_off000060ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60FF 19136 bytes
SHA-256: 1ff3ead325db6faa7b931a8562dea2485ede573d321a491f501e33267cef6888

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