Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6926a4e141831cd…

MALICIOUS

PDF

35.4 KB Created: 2021-07-03 18:20:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6feabec1f648656aa76bfa10654dd194 SHA-1: 89b3632bb063996935598545446eb8f9a6b21253 SHA-256: f6926a4e141831cd39d6c785247e72a34d6cdb7f9d6e62daf94d2788c8a9c125
182 Risk Score

Malware Insights

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

The PDF contains a launch action and multiple embedded URLs, including one that directly advertises a 'free robux' hack. The document body also contains similar lures and URLs, indicating a phishing or scam attempt. The presence of a PDF launch action suggests an attempt to exploit a vulnerability for client execution, likely to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Launch action high PDF_LAUNCH
    PDF contains a /Launch action with an unresolved or extension-less target — treat as potentially dangerous
  • 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.tw/app/431946152/get-robux-for-free-2021-game-hack PDF link annotation
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/how-to-get-minecraft-windows-10-for-free-with-java_GM479516143.pdfIn PDF document text
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/free-glasses-roblox_GM431946152.pdfIn PDF document text
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/hacked-my-instagram-roblox-id_GM431946152.pdfIn PDF document text
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/roblox-breaking-point-hack-script_GM431946152.pdfIn PDF document text
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/roblox-hack-robux-2021-no-survey_GM431946152.pdfIn PDF document text
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/free-roblox-alts-with-robux_GM431946152.pdfIn PDF document text
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/ninja-animation-package-roblox-free_GM431946152.pdfIn PDF document text
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/delete-anything-roblox-hack-script_GM431946152.pdfIn PDF document text
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/coin-master-hack-1021_GM406889139.pdfIn PDF document text
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/launch-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/minecraft-windows-10-free-trial_GM479516143.pdfIn PDF document text
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/coin-master-free-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • https://thoisuviet.vn/public/ckfinder/userfiles/files/free-robux-site_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_off00003262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3262 22496 bytes
SHA-256: d06ad8c062b6e7239e1cf45c96c3a9ab7c59dc535bbbc44ac5e5f6211e43fea1
font_01_sfnt_off000064a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64A1 19224 bytes
SHA-256: c7e6ea762fc2e85d80aa6669a0bc8c0fc47ec2f37a4be0fa16c010cf46ec438a