Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf0dfa40f0931015…

MALICIOUS

PDF

34.4 KB Created: 2021-06-25 14:53:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9573a8ec7be62451b7cdd6af7998cfb3 SHA-1: 45f6ddc58824e99fac3914e3752f03cb2e811f3d SHA-256: bf0dfa40f093101585ba286263747e35de4b304eb5ec335051362bd6086bc45b
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links, identified as a link farm, that redirect to websites promising free in-game currency or hacks. The primary lure is related to obtaining Robux for Roblox, as indicated by the document body and heuristic firings. The presence of multiple external URIs and the 'game hack redirect lure' heuristic strongly suggest a phishing or scamming attempt, likely leading to a malicious download or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/how-to-get-a-robux-in-roblox-for-free-game-hack PDF link annotation
    • http://www.mostraining.co.za/images/groups-that-give-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.mostraining.co.za/images/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.mostraining.co.za/images/coin-master-heaven-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://www.mostraining.co.za/images/coin-master-500-free-spins_GM406889139.pdfIn PDF document text
    • http://www.mostraining.co.za/images/pubg-uc-at-cheap-price_GM1330123889.pdfIn PDF document text
    • http://www.mostraining.co.za/images/how-to-be-naked-on-roblox-free-2021_GM431946152.pdfIn PDF document text
    • http://www.mostraining.co.za/images/coin-master-firebird-card-free_GM406889139.pdfIn PDF document text
    • http://www.mostraining.co.za/images/minecraft-dungeons-free-download_GM479516143.pdfIn PDF document text
    • http://www.mostraining.co.za/images/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.mostraining.co.za/images/new-free-items-on-roblox-promocode_GM431946152.pdfIn PDF document text
    • http://www.mostraining.co.za/images/free-roblox-dominus_GM431946152.pdfIn PDF document text
    • http://www.mostraining.co.za/images/hack-para-phantom-forces-roblox_GM431946152.pdfIn PDF document text
    • http://www.mostraining.co.za/images/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://www.mostraining.co.za/images/legends-of-speed-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • http://www.mostraining.co.za/images/roblox-free-executor_GM431946152.pdfIn PDF document text
    • http://www.mostraining.co.za/images/how-to-get-more-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.mostraining.co.za/images/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://www.mostraining.co.za/images/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • http://www.mostraining.co.za/images/hack-version-of-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • http://www.mostraining.co.za/images/roblox-does-cheat-engine-get-you-banned_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_off00002e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E79 22616 bytes
SHA-256: f6326ffcd785d75ea8f0dd8df69318aa5895758c010daa651befc998023500f0
font_01_sfnt_off00006129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6129 19056 bytes
SHA-256: cd34978578d4a51992e25a8d3be7bbde78f7b5a85fb04d0699f07ef637fde3f7

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