Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a3540fd8ea9a9f…

MALICIOUS

PDF

32.9 KB Created: 2021-07-06 14:11:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: e01c407dbe5d04040147270db924d365 SHA-1: 6c790879bfb99156aa7077711458b43b820d0615 SHA-256: 98a3540fd8ea9a9fbd12948576350fab93b764ca2f9665b8eb2f637918fa3a4f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for free Robux and game hacks, directing users to a known malicious redirector. The embedded URL http://netcdn.tw/app/431946152/i-want-free-robux-game-hack is associated with malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering attack aimed at driving traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/i-want-free-robux-game-hack In PDF document text
    • https://htdvn.com/public/upload/files/roblox-studio-free-download-pc_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/lastrick-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-minecraft-alts_GM479516143.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/minecraft-font-free_GM479516143.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-website_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/como-tener-hacks-de-armas-en-roblox_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/hacked-skybox-roblox_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-tiktok-likes-trial_GM835599320.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-tiktok-likes-2021_GM835599320.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-mod-version-free-download-34-4_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-cheat-engine-alternative_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/100k-robux-free_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/roblox-free-executor_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/hack-coin-master-nyc_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-tiktok-comments_GM835599320.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_off000029c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29C9 22372 bytes
SHA-256: 54e5441b92c152546fc14236bf57c60b603a53c7c1142751fbc5f361be2b9d08
font_01_sfnt_off00005baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BAA 19020 bytes
SHA-256: eae9f8d08779fd2c5c3bd60eb75d4d29ea8b13925606d89c315f12075b4b7800

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