Malicious PDF — malware analysis report

Static analysis result for SHA-256 455a6d006838ed3c…

MALICIOUS

PDF

52.6 KB Created: 2021-05-10 15:14:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 65c52c1f7fdc7c94f8ca2d4f617c300d SHA-1: 75d2bd70adebeee3d1cc13a33309f68c07796c06 SHA-256: 455a6d006838ed3c51f3b3604cdb1ed3d79452b8e8e3f57913d63a3de35f1ccd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to external websites that promise game hacks and free resources, such as 'Coin Master Hack Unlimited Spins Apk Download'. These links are identified as malicious redirectors, indicating a likely attempt to lead users to phishing pages or download malware. The presence of embedded URLs and the ML classifier's flagging strongly support a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6736

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-hack-unlimited-spins-apk-download-game-hack In PDF document text
    • http://cristalysoptic.com/images/coin-master-spin-link-today_GM406889139.pdfIn PDF document text
    • http://cristalysoptic.com/images/roblox-free-exploits_GM431946152.pdfIn PDF document text
    • http://cristalysoptic.com/images/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://cristalysoptic.com/images/earn-roblox_GM431946152.pdfIn PDF document text
    • http://cristalysoptic.com/images/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://cristalysoptic.com/images/scaffold-minecraft-hack_GM479516143.pdfIn PDF document text
    • http://cristalysoptic.com/images/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://cristalysoptic.com/images/coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://cristalysoptic.com/images/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • http://cristalysoptic.com/images/coin-master-unlimited-spin-apk-free-download_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00003fed.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3FED 26744 bytes
SHA-256: 5606dd5ff13c223027351ac721144e312e7985128c8ea024cca68aee86555221
font_01_sfnt_off00007d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D16 3088 bytes
SHA-256: e7854aff7cbc8fbdeb85d2b3d6248d12dc820ede8a581f4eac107fa6446c2222
font_02_sfnt_off000087e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87E1 7960 bytes
SHA-256: cf7ae5cf6bef3222f5a26bec705b492fed0278aec6b16ec101aeda46e0edd2b2
font_03_sfnt_off00009b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B07 18916 bytes
SHA-256: 36b5946d0fa01df03061b9872aea65f63cba93bccd0378a8f0b0329212d0019c
font_04_sfnt_off0000befc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEFC 4272 bytes
SHA-256: fac9a06ceb5574feb8580c075df3ef69dfbd0efa4947186cfe90f11b68eaafb0

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