Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c98e6d2fcb14a21…

MALICIOUS

PDF

34.0 KB Created: 2021-07-03 19:00:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 83ad2e625268bdb75430689a0bbbad82 SHA-1: 37a26d1b6b6f627435ea299799c2457d0a7c1d6b SHA-256: 9c98e6d2fcb14a21429b904fae10f8269efa5eb6667e8227c6b41c4d5f7ccca1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free Robux and game hacks to entice users. It contains multiple links to redirector infrastructure, including http://netcdn.tw/app/431946152/free-800-robux-game-hack, which is flagged as malicious. The document's structure and embedded URLs suggest it is designed to lead users to potentially harmful websites, likely for credential harvesting or malware distribution.

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/free-800-robux-game-hack In PDF document text
    • http://rollipolli.hu/userfiles/files/robux-free-online_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/how-to-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/roblox-e-free_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/how-to-get-free-robux-advertisement_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/hack-robux-to-get-free-clouves_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/roblox-one-piece-millenium-hack-no-script_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/coin-master-hack-ios-jailbreak_GM406889139.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/hacked-account-via-roblox_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/free-roblox-and-robux_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/tiktok-free-download-video_GM835599320.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/get-robux-now_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/coin-master-free-spin-link-list_GM406889139.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/free-robux-images_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/coin-master-link_GM406889139.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/free-gametestrobloxcom-accounts_GM431946152.pdfIn PDF document text
    • http://rollipolli.hu/userfiles/files/how-to-get-free-robux-no-scam_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_002_off00002c4b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2C4B 22860 bytes
SHA-256: 2b5991210e1d7f3f9e0550fd78b5ba6712584e4ee37d1ed83eb6e40c8481ff63
font_01_sfnt_off00005f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F95 19100 bytes
SHA-256: 0ebfa7702a782f6f4faf41f8567968345b55cc7a7d3e2a6dc37d1edcf849371e

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