Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5a81606aa52d13…

MALICIOUS

PDF

34.1 KB Created: 2021-07-03 12:45:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6cb6631377f48ddb1f1201c523a8529d SHA-1: b6a4b4c182016fa9a6efa6ffea2b1ad0ac3fb780 SHA-256: 5b5a81606aa52d13a74e632f6d95cb6f7de3982deba36b826b8ecbac4cf5ea1f
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed as a lure, presenting itself as a way to obtain free in-game currency for popular games like Roblox and Coin Master. It contains numerous links to redirector sites and link farms, including the primary malicious redirector at http://netcdn.tw/app/431946152/get-free-robux-no-verification-game-hack. The document body and heuristics indicate a clear intent to drive traffic to potentially malicious infrastructure, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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
  • 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/get-free-robux-no-verification-game-hack In PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-robux-game-no-password_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-robux-codes-2021-for-adopt-me_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/roblox-free-play-no-download_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/roblox-copy-right-free-codes_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-spin-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-spins-on-coin-master-app_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/roblox-free-3d-models_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/juego-hackeado-de-coin-master_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-robux-test-site_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/how-many-levels-are-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/how-to-download-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/how-to-make-my-own-coin-master-cards-hack_GM406889139.pdfIn PDF document text
    • http://lc.pustaka.unand.ac.id/repository/coin-master-free-spins-2021_GM406889139.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_off00002dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DD5 22480 bytes
SHA-256: 61c0fae21b3c593273533d41c0692476e7207c87cf298c0386efb6a678bc9baa
font_01_sfnt_off0000600e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x600E 19072 bytes
SHA-256: e72ada6374821b36eed7d40ca7e66d9301b0fa24814d932b66fe4108e9a41cd9

Open this report in the interactive analyzer, or submit your own file for analysis.