Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb0158aa64c40d2…

MALICIOUS

PDF

34.1 KB Created: 2021-07-04 07:35:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3587956d7d89f2a30b648285595498c7 SHA-1: aaf2018dfdf10d869e95fd23d22eb4cdc73bf8f4 SHA-256: bbb0158aa64c40d21c61ffcbf47f8fb82394e3804663ab576a143acca7547007
142 Risk Score

Malware Insights

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

The PDF document contains numerous links to websites offering game hacks and free in-game currency, a common lure for phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or redirection scheme. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the links and the 'SE_DOWNLOAD_BUTTON' heuristic suggest the document is designed to trick users into downloading a malicious payload.

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-free-robux-codes-game-hack PDF link annotation
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/bubble-gum-sim-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/spin-and-coin_GM406889139.pdfIn PDF document text
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/final-stand-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/how-to-get-free-robux-in-one-day_GM431946152.pdfIn PDF document text
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/auto-hockey-roblox-piano-hack_GM431946152.pdfIn PDF document text
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/roblox-hack-no-survey-no-password_GM431946152.pdfIn PDF document text
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/how-to-get-free-robux-promotion_GM431946152.pdfIn PDF document text
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/como-hackear-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/free-robux-games_GM431946152.pdfIn PDF document text
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/gamekit-roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/free-money-glitch-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/how-to-sue-roblox_GM431946152.pdfIn PDF document text
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/wurst-client-112-2_GM479516143.pdfIn PDF document text
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/coin-master-hack-apk-35-33_GM406889139.pdfIn PDF document text
    • http://www.mrscoreboardsworld.com/uploaded_files/userfiles/files/coin-master-free-spins-link-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
font_00_sfnt_off00002ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EF6 21984 bytes
SHA-256: d57fbf30e51ded76c9daa53ab43a7d9b13d49d61fa24006f613b63ca0243851a
font_01_sfnt_off00005f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F8D 19156 bytes
SHA-256: d834416b7e9185468f589fe40c9632ebbdbdfe97c28f85986fef52e4c0b1d557

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