Malicious PDF — malware analysis report

Static analysis result for SHA-256 52137ecb72395b11…

MALICIOUS

PDF

34.9 KB Created: 2021-07-09 09:51:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: beaeea620f69d49b63bcf6bd15a50bdb SHA-1: d76a3c41c297c3fae6209e7e42ce9be514b5e2ce SHA-256: 52137ecb72395b11dfe062a0b464db198f3a314d58392f99fa9c89c409cbec97
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs, with a primary focus on luring users with promises of game hacks and free in-game currency for popular games like Coin Master and Roblox. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' strongly indicates this malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classification suggest the document is designed to redirect users to potentially malicious websites, likely for phishing 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/406889139/coin-master-free-spins-link-game-hack PDF link annotation
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/free-robux-codes-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/tiktok-free-roblox-accounts_GM835599320.pdfIn PDF document text
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/pokemon-go-free-app_GM1094591345.pdfIn PDF document text
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/robuxy-com-generator_GM431946152.pdfIn PDF document text
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/roblox-threaten-to-hack_GM431946152.pdfIn PDF document text
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/coin-master-free-food-for-pet_GM406889139.pdfIn PDF document text
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/wurst-client-18-9_GM479516143.pdfIn PDF document text
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/simple-game-hack-com-roblox_GM431946152.pdfIn PDF document text
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/free-robux-for-playing-games_GM431946152.pdfIn PDF document text
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/giving-free-robux-in-this-roblox-group_GM431946152.pdfIn PDF document text
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/wwwfree-robux-hackcom_GM431946152.pdfIn PDF document text
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/roblox-hacking-simulator_GM431946152.pdfIn PDF document text
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/code-cheat-roblox-to-chat_GM431946152.pdfIn PDF document text
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/robux-converter_GM431946152.pdfIn PDF document text
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/is-minecraft-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.travlbuzz.co.uk/uploaded_files/userfiles/files/coin-master-links-to-free-spins_GM406889139.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
stream_002_off00003281.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3281 22784 bytes
SHA-256: 792c8f4fafd251d74477441d5fc56e1aec2152269dae436c7f08bb223ac23456
font_01_sfnt_off000065aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65AA 18344 bytes
SHA-256: 01b831504896dfaed35d51ec646485350627a831fcdd06f8660974e1004fbd35

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