Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5d03cb5ab42cc3a…

MALICIOUS

PDF

34.2 KB Created: 2021-06-21 01:13:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 9d5b8a902ec5be8b2aa3aabd99e7e099 SHA-1: 208879b0e81c13839ecb74bcf7cf57ac19acbb71 SHA-256: d5d03cb5ab42cc3a5d7a2af1d0d32ca2a019685dc4957ac6f6600b9910bf8abc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure at http://netcdn.co/app/431946152/mobile4free24-free-robux-game-hack. The document body and heuristics indicate a lure for free Robux or game hacks, suggesting a phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a malicious intent to redirect users to potentially harmful content.

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.co/app/431946152/mobile4free24-free-robux-game-hack In PDF document text
    • https://www.dahu-villa.com.tw/upload/files/free-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • https://www.dahu-villa.com.tw/upload/files/coin-master-free-spin-sites_GM406889139.pdfIn PDF document text
    • https://www.dahu-villa.com.tw/upload/files/minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • https://www.dahu-villa.com.tw/upload/files/free-coin-master-links_GM406889139.pdfIn PDF document text
    • https://www.dahu-villa.com.tw/upload/files/coinmaster-spin-ml-link_GM406889139.pdfIn PDF document text
    • https://www.dahu-villa.com.tw/upload/files/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • https://www.dahu-villa.com.tw/upload/files/coin-master-free-coins-cheat_GM406889139.pdfIn PDF document text
    • https://www.dahu-villa.com.tw/upload/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.dahu-villa.com.tw/upload/files/robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.dahu-villa.com.tw/upload/files/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • https://www.dahu-villa.com.tw/upload/files/coin-master-heaven-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.dahu-villa.com.tw/upload/files/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.dahu-villa.com.tw/upload/files/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
    • https://www.dahu-villa.com.tw/upload/files/roblox-jailbreak-hack-client-download_GM431946152.pdfIn PDF document text
    • https://www.dahu-villa.com.tw/upload/files/legit-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.dahu-villa.com.tw/upload/files/how-to-hack-coin-master-game-without-root_GM406889139.pdfIn PDF document text
    • https://www.dahu-villa.com.tw/upload/files/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • https://www.dahu-villa.com.tw/upload/files/free-coins--spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.dahu-villa.com.tw/upload/files/pokemon-go-free-raid-passes-2021_GM1094591345.pdfIn PDF document text
    • https://www.dahu-villa.com.tw/upload/files/free-roblox-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_off00002e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E6D 22268 bytes
SHA-256: aae8efd31eba7dafcec69842b7ab97c5ec37694b9b659772e61f45876b24bb89
font_01_sfnt_off00005fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FBC 19292 bytes
SHA-256: bb2799a6af5474a9e42ee2366cc0989121852ac674cf8288f960d2f8ae031d36

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