Malicious PDF — malware analysis report

Static analysis result for SHA-256 21233e88588fbf5a…

MALICIOUS

PDF

34.5 KB Created: 2021-07-06 16:31:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e40051b267a222eaf4286b9d8799388c SHA-1: a9c23269e1bea7e2f7d131129d571d63c1c5f211 SHA-256: 21233e88588fbf5ab31e585bbbef82c9b646647c2ab0a965303169a2a46d6634
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are SEO-optimized to appear as generators for game currency or hacks. The primary URL, http://netcdn.tw/app/431946152/robux-gift-card-free-game-hack, is directly linked to a 'free generator / game hack' lure. This indicates a social engineering tactic to redirect users to potentially malicious sites, likely for phishing or further malware distribution.

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.tw/app/431946152/robux-gift-card-free-game-hack PDF link annotation
    • https://www.bumbar-sport.hr/files/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/how-to-get-100-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/free-robux-games-working_GM431946152.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/roblox-anti-cheat-speed_GM431946152.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/reddit-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/how-to-get-free-robux-on-roblox-mobile-2021_GM431946152.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/my-robux_GM431946152.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/free-robux-hack-club_GM431946152.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/unlimited-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/robloxbux-us-generator_GM431946152.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/coin-master-free-spins-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • https://www.bumbar-sport.hr/files/how-to-get-wings-for-free-on-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_off00002f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F95 22328 bytes
SHA-256: fb68ae16399321f85ada73c665c38f07d24a595f6c03bb4073a7c67b63c35d32
font_01_sfnt_off0000616e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x616E 19112 bytes
SHA-256: 2ea37c508b0c91132d1ae13c4ee486db57383bf0a0a064ac7651587d02fc5b1e

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