Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a8d68cacc66f67…

MALICIOUS

PDF

46.2 KB Created: 2021-06-09 13:53:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: e4a274f4ed29ff99abe3ed357e523cc8 SHA-1: 679a71077903b8386ca9b2b304346d27ab93ce4c SHA-256: 50a8d68cacc66f67d4f9923357caa27c597d871d237a093f8baf87f534e7fe98
142 Risk Score

Malware Insights

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

This PDF document is classified as malicious due to its use of a link farm heuristic, indicating it is designed to redirect users to numerous external sites. The primary lure appears to be 'game hacks' and 'free generators' for popular games like Roblox, which is a common social engineering tactic. The embedded URLs likely lead to pages that either host further malicious content or attempt to trick users into downloading unwanted software.

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/ghost-simulator-roblox-hack-2021-game-hack PDF link annotation
    • https://www.stayon.no/images/how-to-get-admin-commands-on-roblox-without-cheat-engine_GM431946152.pdfIn PDF document text
    • https://www.stayon.no/images/how-to-download-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • https://www.stayon.no/images/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • https://www.stayon.no/images/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.stayon.no/images/plug-toolbox-for-minecraft-free-ios_GM479516143.pdfIn PDF document text
    • https://www.stayon.no/images/roblox-hack-script-list_GM431946152.pdfIn PDF document text
    • https://www.stayon.no/images/how-to-get-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://www.stayon.no/images/earn-free-robux_GM431946152.pdfIn PDF document text
    • https://www.stayon.no/images/fbchampion_GM406889139.pdfIn PDF document text
    • https://www.stayon.no/images/how-to-play-coin-master_GM406889139.pdfIn PDF document text
    • https://www.stayon.no/images/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • https://www.stayon.no/images/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.stayon.no/images/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdfIn PDF document text
    • https://www.stayon.no/images/mcpe-master-unlimited-coins-hack-apk_GM406889139.pdfIn PDF document text
    • https://www.stayon.no/images/pants-roblox-girl-free_GM431946152.pdfIn PDF document text
    • https://www.stayon.no/images/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • https://www.stayon.no/images/free-robux-mobile_GM431946152.pdfIn PDF document text
    • https://www.stayon.no/images/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.stayon.no/images/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • https://www.stayon.no/images/how-to-get-free-robux-without-doing-anything-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_off000052c0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52C0 25696 bytes
SHA-256: ef05be13f2d8f37fed7d363d75b71c83da67f82b84e73b8c4f7eaa4767fcef69
font_01_sfnt_off00008ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EE0 19376 bytes
SHA-256: d4ebb1a4a0f3b9a10c568a299824e9c73444037cdb5ed86891fd46c603e62d61

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