Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0a6da84fe09cb70…

MALICIOUS

PDF

46.6 KB Created: 2021-06-03 12:04:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 619fa02b44d2b97b85102b4a86726dbf SHA-1: 30e3ecb635db091baa715f5817bd7141f69bc499 SHA-256: d0a6da84fe09cb7089150e9acee9475021bc96c1e205fc6b1a7ab55540ad6dee
200 Risk Score

Malware Insights

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

This PDF document employs a lure related to free game currency and displays a fake CAPTCHA to deceive users into clicking malicious links. The primary malicious link identified is https://netcdn.online/app/431946152/how-to-get-free-robux-without-doing-anything-game-hack, which is associated with known malicious redirector infrastructure. The document's content and heuristics strongly suggest an attempt to trick users into executing further malicious content, likely through a drive-by download or a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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 https://netcdn.online/app/431946152/how-to-get-free-robux-without-doing-anything-game-hack In PDF document text
    • http://library.fikes.upnvj.ac.id/repository/pokemon-go-free-zone_GM1094591345.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/robux-for-offers_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/roblox-hack-site_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/mangocheats-com-hack-coin-master-cheat_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/hack-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/roblox-free-accessories_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/minecraft-creative-mode-free_GM479516143.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-promo-code-2021_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/robux-today_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/robuxglobalcom-no-verification_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
stream_004_off00005252.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5252 26436 bytes
SHA-256: b78d5e95d1623ba55fe2ee2d8eaae6aa8bca3cbe988a7af43e4ed3438be449cc
font_01_sfnt_off00009043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9043 19400 bytes
SHA-256: 843e7c6de0628ecb74dfde19cdfb212261a67f0d6d996bc16e2547f6c0bce3d3

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