Malicious PDF — malware analysis report

Static analysis result for SHA-256 924f90d7989a29d4…

MALICIOUS

PDF

33.2 KB Created: 2021-06-18 13:32:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a1c5c58ab4371970c9ff6b170a940369 SHA-1: 92e81619ab58ddc456014cd7a97099e471c63b45 SHA-256: 924f90d7989a29d4f245df3c8c60ed30c89d9d992e22e18dc3c6a9083983992a
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF links for game hacks and cheats. The primary lure appears to be related to Roblox and Minecraft, directing users to potentially malicious sites or further phishing pages. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm designed to attract users searching for game exploits.

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.co/app/431946152/how-to-get-hacked-roblox-account-back-game-hack PDF link annotation
    • http://bit-sky.com/images/plug-toolbox-for-minecraft-free-ios_GM479516143.pdfIn PDF document text
    • http://bit-sky.com/images/minecraft-noob-vs-pro-vs-hacker-vs-god_GM479516143.pdfIn PDF document text
    • http://bit-sky.com/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/roblox-wanted-money-hack_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/minecraft-windows-10-free-trial_GM479516143.pdfIn PDF document text
    • http://bit-sky.com/images/coin-master-free-daily-spins-today_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/is-roblox-free-on-xbox-360_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/free-gear-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/june-29-coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/oprewards-login_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/follow-people-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/free-spins-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://bit-sky.com/images/how-to-hack-in-games-roblox_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/hack-field-of-battle-on-roblox_GM431946152.pdfIn PDF document text
    • http://bit-sky.com/images/roblox-javascript-hack_GM431946152.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
font_00_sfnt_off00002c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C76 21752 bytes
SHA-256: 43e6313829424d6cb0d00e5f8e1e882bc24cde3c03ba17a9f471d3d4cdfc54c1
font_01_sfnt_off00005c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C38 19052 bytes
SHA-256: 77e3c017d67b4c647b41a5e23f873134bded95afd5d2c48cf2e6b50746a4e420

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