Malicious PDF — malware analysis report

Static analysis result for SHA-256 4230b6de3f419be4…

MALICIOUS

PDF

45.9 KB Created: 2021-06-07 17:04:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4f688df774dab93da3de6eed7ea68ac1 SHA-1: 404e003dc75a3b2307675dcfc1bd355a89b968a5 SHA-256: 4230b6de3f419be4830d3d26aeaf2835d6af07d9dc7174633c3750d704015a84
142 Risk Score

Malware Insights

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

The PDF document contains multiple external links, including one that promises 'Roblox Gift Codes Free' and directs to a suspicious URL. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of linked PDFs, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the nature of the links and the ML classification point towards a malicious intent to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/roblox-gift-codes-free-game-hack PDF link annotation
    • http://gieldapracy.pl/images/how-to-make-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://gieldapracy.pl/images/how-to-hack-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://gieldapracy.pl/images/minecraft-launcher-download-free_GM479516143.pdfIn PDF document text
    • http://gieldapracy.pl/images/free-coin-master-game_GM406889139.pdfIn PDF document text
    • http://gieldapracy.pl/images/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • http://gieldapracy.pl/images/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://gieldapracy.pl/images/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • http://gieldapracy.pl/images/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://gieldapracy.pl/images/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://gieldapracy.pl/images/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://gieldapracy.pl/images/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://gieldapracy.pl/images/download-coin-master-hack-tool-v1-9_GM406889139.pdfIn PDF document text
    • http://gieldapracy.pl/images/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://gieldapracy.pl/images/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://gieldapracy.pl/images/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://gieldapracy.pl/images/wurst_GM479516143.pdfIn PDF document text
    • http://gieldapracy.pl/images/coin-master-hack-online-link_GM406889139.pdfIn PDF document text
    • http://gieldapracy.pl/images/roblox-svg-free_GM431946152.pdfIn PDF document text
    • http://gieldapracy.pl/images/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://gieldapracy.pl/images/free-robux-without-human-verification-2021_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
stream_004_off000053ed.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53ED 25904 bytes
SHA-256: 360bfe2f170329d25e5c36b698dcfbeba9e1833aec00964404dd7f6749440217
font_01_sfnt_off000090a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90A7 18348 bytes
SHA-256: 583c21cf4aba489eec288655a1403d5f7680bc2ce81d380a744baf581d3a432e