Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b88dc5b9a5119e7…

MALICIOUS

PDF

47.8 KB Created: 2021-05-16 22:38:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 9e332736f3034518746ae249f95e3f34 SHA-1: c36bfaecdfca84693a7280fee59f2bf309d2b0b1 SHA-256: 7b88dc5b9a5119e71a45200b27180c188ca5f60f836d2e73396c237acb3a3517
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically promoting 'free generator / game hack' lures for popular games. The embedded URLs, such as 'https://netcdn.xyz/app/406889139/coin-master-free-spin-and-coins-links-game-hack', are designed to lead users to potentially harmful content or further malicious sites. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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-spin-and-coins-links-game-hack In PDF document text
    • http://baxtton.com/sites/default/files/files/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • http://baxtton.com/sites/default/files/files/free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://baxtton.com/sites/default/files/files/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://baxtton.com/sites/default/files/files/free-gfx-roblox_GM431946152.pdfIn PDF document text
    • http://baxtton.com/sites/default/files/files/coin-master-hack-2021-free_GM406889139.pdfIn PDF document text
    • http://baxtton.com/sites/default/files/files/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://baxtton.com/sites/default/files/files/free-coins-for-planet-master-game_GM406889139.pdfIn PDF document text
    • http://baxtton.com/sites/default/files/files/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • http://baxtton.com/sites/default/files/files/coin-master-free-spins-link-ios_GM406889139.pdfIn PDF document text
    • http://baxtton.com/sites/default/files/files/coin-master-heaven-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://baxtton.com/sites/default/files/files/roblox-free-executor_GM431946152.pdfIn PDF document text
    • http://baxtton.com/sites/default/files/files/free-roblox-characters_GM431946152.pdfIn PDF document text
    • http://baxtton.com/sites/default/files/files/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://baxtton.com/sites/default/files/files/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://baxtton.com/sites/default/files/files/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://baxtton.com/sites/default/files/files/free-daily-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://baxtton.com/sites/default/files/files/how-to-make-a-group-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://baxtton.com/sites/default/files/files/easy-robux-hack_GM431946152.pdfIn PDF document text
    • http://baxtton.com/sites/default/files/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://baxtton.com/sites/default/files/files/how-to-get-free-robux-instantly_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_off00004b24.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B24 29076 bytes
SHA-256: b962f45c3ca569d70ca31753cfdbb5fc7610a8d338ce1a6f557759ac2d7b3bc9
font_01_sfnt_off00008b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B64 2824 bytes
SHA-256: 381f6d859be141449dd645f7be1484d2a1cf49218dc471b402dae69eaa2b11d5
font_02_sfnt_off00009507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9507 19384 bytes
SHA-256: 58aa9d35037144b1b7beaa7eae9192710c300e12a09041fa94577ba6b21aae70

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