Malicious PDF — malware analysis report

Static analysis result for SHA-256 54695d4370559e68…

MALICIOUS

PDF

35.1 KB Created: 2021-06-17 22:00:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 51e4fba68459a28b4d1205462d6b51ed SHA-1: 49d9c672b91a52dc1e0b47fff678caee80fd5fe4 SHA-256: 54695d4370559e682893a9699fe4aef9eb6bc3191dd8f4e90b3fa5975583219e
200 Risk Score

Malware Insights

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

This PDF document employs social engineering tactics, presenting a fake CAPTCHA or download button to lure users into clicking a malicious link. The primary link, http://netcdn.co/app/431946152/robux-hacks-pastebin-game-hack, is associated with known malicious redirector infrastructure. While no scripts were extracted, the PDF structure and embedded URLs strongly suggest an attempt to redirect the user to a site that likely hosts further malicious content or exploits.

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.
  • 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 http://netcdn.co/app/431946152/robux-hacks-pastebin-game-hack In PDF document text
    • http://gts.edu.gh/library/repository/unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-roblox-for-6-year-old_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/minecraft-hack-2021_GM479516143.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/hacks-master-coin_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coinmaster-gps-user-review-coinmaster-coin-master-hack-pagedemo-index_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/mcpe-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-free-spins-link-march-2021_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-free-spins-and-coins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/como-hackear-coin-master-espaol_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/robux-hack-script-pastebin-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/best-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/aroboy-10-hacker-roblox_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-hack-online-cheat_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/coin-master-game-hack_GM406889139.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://gts.edu.gh/library/repository/roblox-com-games-referrer-roblox-player_GM431946152.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_off000033ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33CE 22104 bytes
SHA-256: 39a20bca1f1053a2f4a92198cce54d75aef8d4ef1b04bbae22bff7f8fbb7c7f3
font_01_sfnt_off00006492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6492 18916 bytes
SHA-256: 70ddc5a1aa28d5c67658d1e9a97507fb2af04325a894b1316d4375007a370739

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