Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b842290f72b1915…

MALICIOUS

PDF

39.7 KB Created: 2021-05-10 15:02:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 6dd66bd35b4992f9a3d02dee247d8253 SHA-1: 6bb9dfb54e65e70426cf7a5de3728fa76a26549b SHA-256: 4b842290f72b19158f3c5d44405b295fd8a78d0540456d14c493946b1ce0687b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector domains, specifically advertising 'free generator / game hack' lures for popular games. The primary redirector URL is https://netcdn.xyz/app/406889139/coin-master-free-spins-hack-apk-download-game-hack, which is flagged as malicious. The document body also contains similar lures and a call to action, reinforcing the phishing and redirection intent. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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 https://netcdn.xyz/app/406889139/coin-master-free-spins-hack-apk-download-game-hack In PDF document text
    • https://willifox.com/images/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://willifox.com/images/free-coins-and-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://willifox.com/images/free-modded-minecraft-server_GM479516143.pdfIn PDF document text
    • https://willifox.com/images/robux-no-verification_GM431946152.pdfIn PDF document text
    • https://willifox.com/images/roblox-font-free_GM431946152.pdfIn PDF document text
    • https://willifox.com/images/free-daily-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://willifox.com/images/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • https://willifox.com/images/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • https://willifox.com/images/coin-master-spin-ml_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
stream_003_off00003cb3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3CB3 26204 bytes
SHA-256: 11f3392c932c84047ed151a36c9483077e027c5bfa3a6c9a51d6ca577996c721
font_01_sfnt_off0000788b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x788B 18636 bytes
SHA-256: 5481d0302ec3c0ba5c2d586dcd50dd6b5df695462c9cc4a17d5c66f6ba577068