Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c9432d1f141275…

MALICIOUS

PDF

44.9 KB Created: 2021-05-14 02:37:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: c92c941929dcb73ad35234c28a11ef7f SHA-1: 448b2aa0e57b8b0932c8d4c416a369a69c7e5a1e SHA-256: 24c9432d1f14127528d8f5039f7d81b9c74e6b10eeee0bdf198f2aafebf32008
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, specifically promoting 'game hacks' and 'free generators' for popular games. The primary malicious link identified is https://netcdn.xyz/app/406889139/coin-master-free-in-app-purchases-game-hack, which is flagged as a known malicious redirector. The document body, though partially obfuscated, contains references to game-related cheats and generators, reinforcing the lure. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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-in-app-purchases-game-hack In PDF document text
    • http://www.friendshiptransport.net/images/how-to-get-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • http://www.friendshiptransport.net/images/minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://www.friendshiptransport.net/images/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.friendshiptransport.net/images/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • http://www.friendshiptransport.net/images/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://www.friendshiptransport.net/images/does-roblox-premium-expire_GM431946152.pdfIn PDF document text
    • http://www.friendshiptransport.net/images/krnl-download_GM431946152.pdfIn PDF document text
    • http://www.friendshiptransport.net/images/http-bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.friendshiptransport.net/images/free-spins-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.friendshiptransport.net/images/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.friendshiptransport.net/images/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.friendshiptransport.net/images/roblox-money-hack_GM431946152.pdfIn PDF document text
    • http://www.friendshiptransport.net/images/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://www.friendshiptransport.net/images/microsoft-rewards-roblox_GM431946152.pdfIn PDF document text
    • http://www.friendshiptransport.net/images/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.friendshiptransport.net/images/roblox-website-robux_GM431946152.pdfIn PDF document text
    • http://www.friendshiptransport.net/images/coin-master-hack-club_GM406889139.pdfIn PDF document text
    • http://www.friendshiptransport.net/images/coin-master-daily-rewards-link_GM406889139.pdfIn PDF document text
    • http://www.friendshiptransport.net/images/coin-master-pc-hack_GM406889139.pdfIn PDF document text
    • http://www.friendshiptransport.net/images/free-roblox-hair-boy_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b05.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B05 24700 bytes
SHA-256: c2f63921ecd1dceeb2ef9e4a5c6ee80cb3f230eea6720bd3d94794092cf0a3be
font_01_sfnt_off0000836c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x836C 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D1E 18348 bytes
SHA-256: bba11a92b86dcddffe095d18ae0e4d200b7b1fd7f3395945f98eac5abaa0e7bf

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