Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e6f740bb242f5a…

MALICIOUS

PDF

33.5 KB Created: 2021-07-04 01:48:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a9073d434941a617ca5723108665d0d5 SHA-1: 0f50dc0fa2751deafc5c0565ba10975127003279 SHA-256: d8e6f740bb242f5a4a02989ddf269c3c3c39a37a635de7e136778b2ffa8a8482
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains links to a known malicious redirector infrastructure, specifically advertising a 'Roblox Robux Hack Generator'. This redirector then points to other malicious PDFs hosted on a separate domain. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users with game-related cheats to a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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.tw/app/431946152/roblox-robux-hack-generator-game-hack In PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-robux-no-human-verification-no-survey-ios_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/fly-cheat-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/get-free-robux-gg_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-robux-2021-march_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/how-to-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/roblox-free-radio_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-robux-2021-no-download_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/free-roblox-accounts-with-builders-club_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/minecraft-free-download-2021_GM479516143.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/minecraft-java-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/roblox-huge-field-fre_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/roblox-admin-hack_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/coin-master-hack-version-download-2021_GM406889139.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/robux-free-co_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/cool-avatars-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/minecraft-java-account-free_GM479516143.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/actual-free-robux-noothing-reques_GM431946152.pdfIn PDF document text
    • http://www.jsvillas.com.tw/assets/files/roblox-prison-life-btools-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
font_00_sfnt_off00002e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E16 21892 bytes
SHA-256: 43baa208ba34431d7b1f7a1cf3fe45dacd83e113806327f16a726d8440b4adde
font_01_sfnt_off00005e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E0A 18900 bytes
SHA-256: e419110d4009e271ea11aee689c1aa7fe2ca079d33d0815bd6a59eb0f8b0c4e6

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