Malicious PDF — malware analysis report

Static analysis result for SHA-256 157c4ad74efa550c…

MALICIOUS

PDF

42.4 KB Created: 2021-05-15 02:37:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: cc3601a6aaa9833e6766545fa7cb3120 SHA-1: b1f6deabec3d44a21ea461b6404fd26bff83a05f SHA-256: 157c4ad74efa550c9aa56ef98f896fa2cf49829e41a420b19d00f94e581a8e51
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links and a lure related to game hacks and generators, specifically mentioning 'Robux'. The ML classifier strongly flagged this PDF as malicious. The primary malicious URL identified is https://netcdn.xyz/app/431946152/how-to-get-more-robux-game-hack, which likely serves as a landing page for a scam or malware download. No scripts were extracted, but the PDF structure and embedded URLs indicate a social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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-more-robux-game-hack PDF link annotation
    • http://www.bripi.pl/images/freerobuxhack-us_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/free-roblox-groups_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/free-spins-coin-master-ios-2021_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/best-free-minecraft-server-hosting-reddit_GM479516143.pdfIn PDF document text
    • http://www.bripi.pl/images/how-to-get-free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/new-free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/coin-master-free-spins--spins_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/free-spin-coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/today-coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/minecraft-windows-10-free-with-java_GM479516143.pdfIn PDF document text
    • http://www.bripi.pl/images/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • http://www.bripi.pl/images/robux-hack-tools_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/how-to-add-mods-to-minecraft-pe_GM479516143.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_off00004881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4881 25392 bytes
SHA-256: 7f8dba783d0be93377f765193c8604483317bf62b8b5610d02174a19e8081ba8
font_01_sfnt_off00008307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8307 18312 bytes
SHA-256: b63754bab8a539e11eebb32f86c31dbe9ceb60be690df901f3a3ba32c84f6f1e

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