Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a4acc5116ea05a…

MALICIOUS

PDF

45.9 KB Created: 2021-06-10 19:40:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 8599605db9f554a7c53828098946635a SHA-1: d395ca21d6daa19e7f2435614a3b7ab940e7e612 SHA-256: a3a4acc5116ea05afd0fdc81e4cd1c5c307de9938ce3cd31acf67f5e4291366e
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple links to redirectors and a link farm, aiming to trick users with a fake CAPTCHA lure for 'game hacks'. The primary malicious URL identified is https://netcdn.tw/app/431946152/all-ways-to-get-free-robux-2021-game-hack. The document body, though partially corrupted, contains references to game hacks and URLs, reinforcing the lure. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 https://netcdn.tw/app/431946152/all-ways-to-get-free-robux-2021-game-hack In PDF document text
    • http://dismarinamt.com.br/images/play-roblox-for-free-on-google_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/coin-master-free-spins-link-2021-app_GM406889139.pdfIn PDF document text
    • http://dismarinamt.com.br/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/coin-master-hack-ios-reddit_GM406889139.pdfIn PDF document text
    • http://dismarinamt.com.br/images/free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://dismarinamt.com.br/images/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/mine-minecraft-games-for-free_GM479516143.pdfIn PDF document text
    • http://dismarinamt.com.br/images/como-hackear-coin-master-en-espaol_GM406889139.pdfIn PDF document text
    • http://dismarinamt.com.br/images/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://dismarinamt.com.br/images/play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://dismarinamt.com.br/images/free-robux-mod_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/how-to-get-20210-robux-no-hack_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/roblox-scp-079-free-model_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/money-cheats-for-rocitizens-on-roblox_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/cheat-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/how-to-get-minecraft-java-edition-for-free_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_off0000526a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x526A 26196 bytes
SHA-256: 7bc557b414d8ad28d83f2b72a72299ee42a6edeaeaafc4fb6e7ee6add33075fb
font_01_sfnt_off00008e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E08 19200 bytes
SHA-256: 82efc64117c2ff3e90abc01f84d5464b72fc4e578f0d229487656e6739acfd0d

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