Malicious PDF — malware analysis report

Static analysis result for SHA-256 4449d1e11984410e…

MALICIOUS

PDF

34.7 KB Created: 2021-07-05 11:52:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: bd7ef28777278ccf05540510836fe676 SHA-1: bd946767ccd01c61287e68e85906856a7566c7c1 SHA-256: 4449d1e11984410ecd38171bf7f2d8beb133eab9adb019001a7928cce3b620f5
150 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external links, many of which are associated with game hacks and free item lures. The primary intent appears to be directing users to potentially malicious websites that exploit interest in popular games like Roblox and Coin Master. The embedded JavaScript likely facilitates the redirection or further malicious activity upon opening the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.tw/app/431946152/how-to-get-free-robux-without-human-verification-game-hack PDF link annotation
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/how-to-play-roblox-on-macbook-pro-itunes-for-free_GM431946152.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/free-spins-coin-master-ios-links_GM406889139.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/free-minecraft-mods_GM479516143.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/free-robux-real-no-verification_GM431946152.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/robloxhack-pro-gamerscom-robux_GM431946152.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/how-to-bypass-cheat-engine-64-on-roblox_GM431946152.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/free-spin-app-coin-master_GM406889139.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/how-to-hack-roblox-for-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/robux-page_GM431946152.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/coin-master-free-link-blogspot_GM406889139.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/groups-in-roblox-that-give-you-free-clothes_GM431946152.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/coin-master-tricks_GM406889139.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/free-roblox-account-with-pin_GM431946152.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/free-virtual-items-codes-roblox_GM431946152.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/albertsstuff-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/dragon-ball-x-hack-roblox_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_off0000307a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x307A 21704 bytes
SHA-256: a68346c14752a80b880c96c368be0ebc0623873f185fcd03f1dece7388806125
font_01_sfnt_off0000603f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x603F 19860 bytes
SHA-256: 495fe8ab67ccc92980b130970b14ca59a4055a895de5252c8ccba287623abf67

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