Malicious PDF — malware analysis report

Static analysis result for SHA-256 50942d1f0f1f5dbd…

MALICIOUS

PDF

35.3 KB Created: 2021-07-03 14:42:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 07fba1cd9da8fd8dce76e46b35b6263c SHA-1: 0a40ee38753e9682c074ec48ef238a226e20961a SHA-256: 50942d1f0f1f5dbd63ee94e15ba5458520eb79ac71cc1e7612b33e6c54c45ebe
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple external links, including one to 'netcdn.tw' and a large number of links hosted on 'donjastubica.hr', which are identified as a link farm. The document body and heuristics suggest a lure related to game hacks and free currency, indicating a phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and extensive linking are indicative of malicious intent, likely to redirect users to potentially harmful websites.

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.tw/app/406889139/free-spins-coin-master-2021-today-game-hack PDF link annotation
    • http://www.donjastubica.hr/files/doge-roblox-hat-free_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/inspect-element-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/how-can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.donjastubica.hr/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/coin-drop-master-free_GM406889139.pdfIn PDF document text
    • https://www.donjastubica.hr/files/coin-master-hack-extension_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/hacks-de-pago-para-roblox_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/free-roblox-money_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/how-to-hack-on-paint-and-guess-roblox_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/free-roblox-gift-card-codes-2021-live_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • https://www.donjastubica.hr/files/hackear-juego-coin-master-espaol_GM406889139.pdfIn PDF document text
    • https://www.donjastubica.hr/files/coin-master-pc-game-free-download_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/comment-faire-si-on-a-ete-hack-sur-roblox_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/coin-master-free-spins-bit-ly_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_off000031d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31D3 22896 bytes
SHA-256: f314e0233c82e59e4885f6c4cf50edfea54a2e1e9e89051aa4a62a09e4dce30a
font_01_sfnt_off0000652d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x652D 18928 bytes
SHA-256: dadcf5174bb2e6041b94f83e832c5e3e9a18ba888fbfa9b44f22d907c203bba1

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