Malicious PDF — malware analysis report

Static analysis result for SHA-256 541c6399020bc4bc…

MALICIOUS

PDF

45.3 KB Created: 2021-06-08 19:12:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 41ee981c1f0e79b5025e23607f6d1068 SHA-1: 5b1ef44d9831cee35039379e9a66904c9002be72 SHA-256: 541c6399020bc4bcabde30e3da2a1c741204ac08ab1f9442a4302d3a2a31f17a
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a high-confidence heuristic indicating it links to a 'free generator / game hack' redirector, specifically pointing to a URL related to 'robux game hack'. The document body, though partially garbled, contains similar keywords and the authoring application suggests it was generated by wkhtmltopdf, often used for creating deceptive PDFs. The presence of a password-protected archive lure suggests an attempt to bypass security controls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/why-can-i-not-hack-robux-game-hack PDF link annotation
    • http://sbm-nn.ru/images/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-hack-xyz-download-free_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/robux-free-co_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-a-free-skin-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-hack-coin-master-in-pc_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/minecraft-free-download-iphone_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-coin-spin-daily-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/hackear-coin-master-android_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/50-free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-spins-link-2021-ios_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/claim-free-robux-button_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/minecraft-beta-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f7b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F7B 27352 bytes
SHA-256: 13f0db2bd98d98fd34bc53d547e1648f5a80a87b8b7f67292dcb4bfb75dbeebd
font_01_sfnt_off00008c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C98 18896 bytes
SHA-256: d28726d626ca0d53e905cb1a8af2837ae3a58b94318c4412ce433608b459b51b

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