Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b72c3b4151246d…

MALICIOUS

PDF

34.8 KB Created: 2021-06-26 09:17:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 641d2493443d5eb0fd6def27fc27c025 SHA-1: 6cd97c8ece77c1c9763f5e4e7ea59ae8909e249e SHA-256: a2b72c3b4151246d2bb75ccf4e328cc3fa5ef7ec8fd5ceae1b13ea6b30cee85a
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links and references to 'free Robux' and game hacks, a common lure for malicious content. The primary URL, http://netcdn.co/app/431946152/efree-robux-hack-toold-game-hack, likely serves as a redirector to a malicious site or directly hosts a payload. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering attack aimed at tricking users into downloading further malware or visiting phishing sites.

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.co/app/431946152/efree-robux-hack-toold-game-hack PDF link annotation
    • http://www.elsire.co.in/uploaded_files/userfiles/files/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elsire.co.in/uploaded_files/userfiles/files/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • http://www.elsire.co.in/uploaded_files/userfiles/files/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • http://www.elsire.co.in/uploaded_files/userfiles/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.elsire.co.in/uploaded_files/userfiles/files/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://www.elsire.co.in/uploaded_files/userfiles/files/what-is-robux-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.elsire.co.in/uploaded_files/userfiles/files/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elsire.co.in/uploaded_files/userfiles/files/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elsire.co.in/uploaded_files/userfiles/files/free-minecraft-for-kids_GM479516143.pdfIn PDF document text
    • http://www.elsire.co.in/uploaded_files/userfiles/files/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://www.elsire.co.in/uploaded_files/userfiles/files/roblox-can-someone-hack-my-account-with-username_GM431946152.pdfIn PDF document text
    • http://www.elsire.co.in/uploaded_files/userfiles/files/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.elsire.co.in/uploaded_files/userfiles/files/eroblox-hq-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elsire.co.in/uploaded_files/userfiles/files/coin-master-heaven-links_GM406889139.pdfIn PDF document text
    • http://www.elsire.co.in/uploaded_files/userfiles/files/100-robux_GM431946152.pdfIn PDF document text
    • http://www.elsire.co.in/uploaded_files/userfiles/files/how-long-is-the-minecraft-free-trial_GM479516143.pdfIn PDF document text
    • http://www.elsire.co.in/uploaded_files/userfiles/files/minecraft-free-apk_GM479516143.pdfIn PDF document text
    • http://www.elsire.co.in/uploaded_files/userfiles/files/noob-vs-pro-vs-hacker-vs-god-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://www.elsire.co.in/uploaded_files/userfiles/files/coin-master-hack-mod_GM406889139.pdfIn PDF document text
    • http://www.elsire.co.in/uploaded_files/userfiles/files/minecraft-nintendo-switch-digital-code-free_GM479516143.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_off00003028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3028 22720 bytes
SHA-256: a25cfea3c3161a09cbabe7e201dc9aab126677dbbfdd469c9b26d134a5aa23f4
font_01_sfnt_off000062e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62E6 18972 bytes
SHA-256: b73361a01238276958fe4ece6ed522214b05bd40de0a47268e2fdad30cd2b5eb

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