Malicious PDF — malware analysis report

Static analysis result for SHA-256 677b76daea1d7c2e…

MALICIOUS

PDF

35.4 KB Created: 2021-06-26 03:07:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8cb41e693e185a26358a37ec9266c0f4 SHA-1: d7dedb78e2540ff492c56fcd2a26954c44722cc3 SHA-256: 677b76daea1d7c2e335490b87042da02ee15f602e7393e2e9a5283273b8dc2d5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of game hacks and free currency to entice users into clicking malicious links. The embedded URLs, such as http://netcdn.co/app/431946152/best-roblox-game-to-hack-on-game-hack, lead to redirectors that serve further malicious PDF files. The ML classifier strongly indicates malicious intent, and the document body reinforces the lure with relevant keywords.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.co/app/431946152/best-roblox-game-to-hack-on-game-hack In PDF document text
    • http://gts.edu.gh/library/repository/get-free-followers-roblox_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/moon-active-games_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-hack-mod-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-get-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/raw-paste-data-roblox-hack_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-free-attack-hack_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-get-free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-cheat_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-roblox-clothes-girl_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/tix-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-download-wurst_GM479516143.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/how-to-get-any-item-for-free-robux_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-3533-android-hack_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/robux-robux_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-robux-app-real_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-skin-free_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-robux-codes-not-used-2021-july_GM431946152.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_off000033fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33FC 22216 bytes
SHA-256: 85636768e364b1c7814e3da1d54fbe109468d515bd3ae081004374b770b0cb71
font_01_sfnt_off00006542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6542 19020 bytes
SHA-256: f71fe31c2abecfd510ee9b379db620752b42fc20b4ad56c2b1cf949eb5416817