Malicious PDF — malware analysis report

Static analysis result for SHA-256 837c93d73a55cb12…

MALICIOUS

PDF

33.8 KB Created: 2021-07-19 15:24:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4136e6150e15415f590daab5a4672799 SHA-1: 8f51b6992e05c77b848dae4c2c88c00faaf6716a SHA-256: 837c93d73a55cb12eba376111096b619e9a64e27a66b2aea8392665349767822
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a 'free Robux generator' and links to external URLs that host similar content. The ML classifier strongly indicated maliciousness, and the document body explicitly contains a URL designed to trick users into clicking for game hacks. No scripts were extracted, but the embedded URLs and the nature of the lure suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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/431946152/how-to-get-free-robux-2021-no-human-verification-game-hack PDF link annotation
    • https://www.tiancom.com.tw/upload/files/free-robux-no-download_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/minecraft-bedrock-hacks_GM479516143.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/free-robux-script_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/free-disney-plus-accounts-tiktok_GM835599320.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/free-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • https://www.tiancom.com.tw/upload/files/how-to-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B3B 22620 bytes
SHA-256: bcc261a7cc9342d770985321c9406795220a0cdedfd561f9eba176ebf2aa0b4b
font_01_sfnt_off00005dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD9 19612 bytes
SHA-256: 54ebe35a97e5c18431d6c6e5b4deed42a4ccc67a7ee7c9e38a95be4cecadf5db

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