Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd2b3a3a9cfd15f0…

MALICIOUS

PDF

32.8 KB Created: 2021-07-03 20:25:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0f61aac6e69e33e7260f14b7515ef40d SHA-1: 49857137e04a41141cc499c259dd1b5cfb3fba26 SHA-256: dd2b3a3a9cfd15f026eda17093575e5ed59c3ae9f87ddaa62626c4cd102acd2f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting game hacks and free in-game currency. The primary lure URL is http://netcdn.tw/app/406889139/coin-master-free-spins-bit-ly-game-hack, which is flagged as a malicious redirector. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lure suggest an attempt to drive users to potentially malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/406889139/coin-master-free-spins-bit-ly-game-hack In PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/minecraft-pocket-edition-free_GM479516143.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/fairy-tail-ultimate-adventure-roblox-how-to-hack_GM431946152.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/ninja-legend-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/minecraft-hacked-apk_GM479516143.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/is-getting-free-robux-real_GM431946152.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/minecraft-free-ios-no-verification_GM479516143.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/how-to-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/coin-master-code-hack_GM406889139.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/how-to-get-free-robux-august-2021_GM431946152.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/earn-robux-sites_GM431946152.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/free-promo-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/free-coin-master-gold-cards_GM406889139.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/tiktok-follower-bot-free_GM835599320.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/pubg-uc-exchange_GM1330123889.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/does-roblox-hack-me-put-a-virus-on-your-computer_GM431946152.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/coin-master-free-spins-bit-ly_GM406889139.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_off00002b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B81 22316 bytes
SHA-256: 054340dd84c69d50a5c3318627112f757fcb80a50a5d0a19bf82dcc49f622d75
font_01_sfnt_off00005cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CFB 18572 bytes
SHA-256: e4c5cc8e0af759db0a59985e9b5dd8949b05b8be0a7a9f9c37067d683851e255