Malicious PDF — malware analysis report

Static analysis result for SHA-256 856902d6c8b79eca…

MALICIOUS

PDF

43.6 KB Created: 2021-06-14 01:18:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 13953d48d7bd6108e679ebdf97dda087 SHA-1: 850acc9fb133f9fcd1751e6277ea68622aa7b84f SHA-256: 856902d6c8b79eca7e91f80a6263856f875992a961ab489e37b648660f322aa5
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, masquerading as "game hacks" or "free generators" for popular online games. It also displays a fake CAPTCHA to trick users into interacting with the malicious content. The primary goal appears to be directing users to potentially harmful websites that may host further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/how-to-get-back-a-hacked-roblox-account-game-hack In PDF document text
    • http://pustaka.ust.ac.id/repository/freespincoin-masterlinkdownload_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-400-spin-link-today_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/www-rbx-com_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-on-ipad-ios_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/minecraft-bedrock-edition-hacks_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/google-how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/pokemon-go-for-free-download_GM1094591345.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/daily-free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-card-hack-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-script-hack_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_003_off00004972.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4972 26208 bytes
SHA-256: 97e83a86e0f6c6f07d140380342a146661dbccdd87979a9138a818adcea471ca
font_01_sfnt_off000085c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85C5 18948 bytes
SHA-256: 5af7af9e84b7ce16ef9031127cb9eabee04c644e2aad43cfcfefe0c529765408

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