Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8ea1a193b0494b…

MALICIOUS

PDF

50.5 KB Created: 2021-05-14 19:30:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4d76b35ac36faeb4768b5e4f493667f6 SHA-1: 12296179b627bf1ea831cdcb7f479b076e180448 SHA-256: da8ea1a193b0494b09019ca51fd484c672233eea0223857f37bdc59e8f95975b
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are disguised as PDF files related to game hacks and free currency. The primary lure appears to be 'free Robux' or 'free spins' for games, directing users to potentially malicious sites. The presence of a link farm heuristic and ML classification further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9349

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.xyz/app/431946152/how-to-get-free-robux-no-human-verification-2021-game-hack PDF link annotation
    • http://www.lrnetwork.es/images/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://www.lrnetwork.es/images/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://www.lrnetwork.es/images/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.lrnetwork.es/images/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.lrnetwork.es/images/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://www.lrnetwork.es/images/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.lrnetwork.es/images/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.lrnetwork.es/images/coin-master-coin-link_GM406889139.pdfIn PDF document text
    • http://www.lrnetwork.es/images/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • http://www.lrnetwork.es/images/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.lrnetwork.es/images/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://www.lrnetwork.es/images/roblox-ftw_GM431946152.pdfIn PDF document text
    • http://www.lrnetwork.es/images/app-master_GM406889139.pdfIn PDF document text
    • http://www.lrnetwork.es/images/update-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.lrnetwork.es/images/do-robux-generators-work_GM431946152.pdfIn PDF document text
    • http://www.lrnetwork.es/images/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://www.lrnetwork.es/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.lrnetwork.es/images/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.lrnetwork.es/images/free-spins-coin-master-march-2021_GM406889139.pdfIn PDF document text
    • http://www.lrnetwork.es/images/robux-premium_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b26.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B26 25124 bytes
SHA-256: ba081b11e11e44dbe6caa8dcffc34d2f7a0ddc3149a21f081d35c24fd3cb10d8
font_01_sfnt_off00008486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8486 8252 bytes
SHA-256: 7ebedd6b182173c8e55836cb0d114b2c4a0ac85c96a51b9f0706c935f8415fea
font_02_sfnt_off00009f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F9B 19428 bytes
SHA-256: dc7c459a90b1a398d2ee51f52972ed8a07904c77cd045887558a99bdb9823e3c

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