Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc7d59f1049a92b…

MALICIOUS

PDF

34.9 KB Created: 2021-06-27 04:32:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4355e171eea730b0c846e6074451ce13 SHA-1: 8f05f449a9543855b632c1cc3b6a5bce5a87be6d SHA-256: 6dc7d59f1049a92b8ec97da5a4863cdd2d0dcb2dbc16debbb2bbf2bcf02f52b4
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links and a lure related to free game currency and hacks, specifically mentioning 'Robux'. The primary link, http://netcdn.co/app/431946152/how-can-i-get-free-robux-for-friends-game-hack, is likely a redirector to a malicious site or a download for malware. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' strongly indicates this malicious intent. No scripts were extracted, but the document structure and embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-can-i-get-free-robux-for-friends-game-hack PDF link annotation
    • https://smark.com.tw/image/data/files/roblox-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/pokemon-go-free-spoofer_GM1094591345.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/this-app-gives-you-free-robux_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/roblox-top_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-202119_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/static-moonactive-net-link_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-free-spins-deutsch-download-ios-link_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-account-roblox-2021_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/roblox-com-www_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/hack-roblox-fixed-pc-infinity-heroes-x100_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-minecraft-education-edition_GM479516143.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-net_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/youtube-free-robux-easy-stes_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/withdraw-robux_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-minecraft-java-edition-account_GM479516143.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-get-free-money-in-adopt-me-roblox-2021_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_off00003253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3253 21948 bytes
SHA-256: 17bfbf3f3a2d2cae81318401185f8ffcf5c9a81f54128afad95014a3ad66d6df
font_01_sfnt_off00006283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6283 19280 bytes
SHA-256: 6fc9379d72c7786592161df4f7fb5b96a37b65e0e07e24ad7bff8ef991780404

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