Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c23b7acc4b7d6da…

MALICIOUS

PDF

34.7 KB Created: 2021-06-29 09:03:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 0ca4cabbcb968985af8cb5bcc370c04d SHA-1: 87bfc8c91382102df50027c8914a3c5a7a47159d SHA-256: 4c23b7acc4b7d6dabe458c59efedb1d21fcf51558bc862cf14719da1cd0739d3
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are SEO-optimized PDFs related to game hacks and cheats for popular games like Roblox and Coin Master. The primary lure appears to be 'free Robux' or game exploits, indicating a phishing or scam attempt. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading malicious content or visiting compromised sites.

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/what-is-the-code-for-free-robux-game-hack PDF link annotation
    • https://sensorcamera-tw.com/upload/files/how-to-change-roblox-name-for-free_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/apk-robux-hack_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/minecraft-cheat-client_GM479516143.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/coin-master-online-hack-no-survey-no-password_GM406889139.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/free-spins-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/best-cheat-engine-for-roblox_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/roblox-free-admin-script-pastebin_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/camisetas-de-roblox-de-hacker_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/how-to-fly-hack-roblox-lumber-tycoon_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/generator-free-robux-facil_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/free-robux-survey_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/minecraft-noob-vs-pro-vs-hacker-vs-god_GM479516143.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/roblox-free-game-pass-glitch_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/what-is-e-free-roblox_GM431946152.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/free-minecraft-website_GM479516143.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
    • https://sensorcamera-tw.com/upload/files/free-coins-and-spins-coin-master_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_off00002f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F7C 22400 bytes
SHA-256: fa4b21044a3e763ce4842bcc6c158c72037f77907ee13c1784993e7ee27d7064
font_01_sfnt_off0000617f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x617F 19360 bytes
SHA-256: 4e22bf190acf2ae677a85f1672866d8b3753e89f30f1f19a60a2800843327aff

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