Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc63971767c9c62…

MALICIOUS

PDF

35.2 KB Created: 2021-07-05 09:02:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 6210a67a04a5404cbc005e9a4a2e700d SHA-1: 23b1464cb707be135a7b053277b8c0ad481b9429 SHA-256: 9bc63971767c9c625475771c689a735b5e2d39f6c458cfb995575d396cc7d39f
122 Risk Score

Malware Insights

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

The PDF document contains a lure for a 'free Robux generator' which redirects to a malicious URL. This is a common tactic for credential phishing or distributing further malware. The ML classifier strongly indicated maliciousness, and the presence of multiple game-hack related URLs reinforces the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: http://netcdn.tw/app/431946152/free-robux-generator-com-roblox-hack-game-hack.
  • 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.tw/app/431946152/free-robux-generator-com-roblox-hack-game-hack PDF link annotation
    • http://artistaone.co/userfiles/files/como-hacker-roblox-en-ordenador-en-1-paso-robux-free_GM431946152.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/roblox-luac-scripts-for-lvl-hack-shinobi-life_GM431946152.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/free-shirt-roblox-adidas_GM431946152.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/free-robux-no-download_GM431946152.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/free-back-accessories-roblox_GM431946152.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/roblox-free-hats_GM431946152.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/roblox-its-free_GM431946152.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/roblox-boku-no-roblox-remastered-hack-script_GM431946152.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/minecraft-hacked-apk_GM479516143.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/can-you-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/how-to-get-free-robux-on-roblox-2021-easy_GM431946152.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/how-do-you-use-cheat-engine-on-roblox_GM431946152.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/coin-master-spin-hack_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_off0000309b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x309B 22752 bytes
SHA-256: b2403e0acddaf4bbe2ef511b1574c66001ade6b20530b55bdcc9cee1b015b415
font_01_sfnt_off000063b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63B4 19324 bytes
SHA-256: b5fe64a349a1260a8bf1e39cb434a35d84e03f20b24c2703f62dd6d7df3547b9

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