Malicious PDF — malware analysis report

Static analysis result for SHA-256 793b87b59cf2011a…

MALICIOUS

PDF

45.3 KB Created: 2021-06-11 01:32:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6fb7c3e0e287e0dcfc81ad035510af9f SHA-1: 47f0cfee984256fdd3f1a8f26d524f389345ba5f SHA-256: 793b87b59cf2011a3a46cd155d18be89bfdc0d190f26076bc485d71b32615682
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector, masquerading as a 'free generator / game hack'. The document body and embedded URLs suggest a lure for game-related cheats or accounts, likely to lead users to phishing or malware download sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/free-roblox-accounts-with-obc-lifetime-2021-game-hack In PDF document text
    • http://www.buapit.ac.th/UserFiles/File/can-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/how-to-get-the-elite-radio-in-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/free-roblox-exploit-nonwearedevs_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/coinmaster-twitter_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/coin-master-spin-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/watch-ads-for-robux_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/how-to-log-out-of-coin-master_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/coin-master-hack-trick-2021_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/minecraft-free-ios-no-verification_GM479516143.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/easy-robux-generator_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/tiktok-free-package_GM835599320.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/coin-master-spin-ml-link_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/coin-master-spin-link-today-2021_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_004_off0000518c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x518C 24952 bytes
SHA-256: 255eb42e51381cb3bc814d30ffd70fc5f067655fa5337ef50f7963c9ea768eff
font_01_sfnt_off00008b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B62 19340 bytes
SHA-256: e63abbf80315a26b01dbcae1d5d6373f5fa5bf34a1ce76b28500f937cdb2064f

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