Malicious PDF — malware analysis report

Static analysis result for SHA-256 b423bd4ef6fc7679…

MALICIOUS

PDF

48.1 KB Created: 2021-05-16 13:57:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 05a1992f11e7ecf14657cc21c6f1db32 SHA-1: 0f557d8a87484081b108bd5dc53d59756bd42f81 SHA-256: b423bd4ef6fc767964f883d37e41839af2b41c7c883af9f9d2dfb9648227447a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links designed to lure users into clicking on them by promising game hacks and free currency. One of the primary links, 'https://netcdn.xyz/app/406889139/coin-mast-hacks-game-hack', is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8715

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-mast-hacks-game-hack In PDF document text
    • https://infopromotransvision.com/ckfinder/userfiles/files/free-roblox-money_GM431946152.pdfIn PDF document text
    • https://infopromotransvision.com/ckfinder/userfiles/files/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • https://infopromotransvision.com/ckfinder/userfiles/files/minecraft-114-4-download_GM479516143.pdfIn PDF document text
    • https://infopromotransvision.com/ckfinder/userfiles/files/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • https://infopromotransvision.com/ckfinder/userfiles/files/coin-master-free-spins-a2z-help_GM406889139.pdfIn PDF document text
    • https://infopromotransvision.com/ckfinder/userfiles/files/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://infopromotransvision.com/ckfinder/userfiles/files/give-free-robux_GM431946152.pdfIn PDF document text
    • https://infopromotransvision.com/ckfinder/userfiles/files/free-minecraft-education-edition_GM479516143.pdfIn PDF document text
    • https://infopromotransvision.com/ckfinder/userfiles/files/mcpe-hacks_GM479516143.pdfIn PDF document text
    • https://infopromotransvision.com/ckfinder/userfiles/files/free-robux-images_GM431946152.pdfIn PDF document text
    • https://infopromotransvision.com/ckfinder/userfiles/files/watch-ads-for-robux_GM431946152.pdfIn PDF document text
    • https://infopromotransvision.com/ckfinder/userfiles/files/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://infopromotransvision.com/ckfinder/userfiles/files/how-do-you-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://infopromotransvision.com/ckfinder/userfiles/files/get-roebucks-com_GM431946152.pdfIn PDF document text
    • https://infopromotransvision.com/ckfinder/userfiles/files/haktuts-coin-master_GM406889139.pdfIn PDF document text
    • https://infopromotransvision.com/ckfinder/userfiles/files/coin-master-level-3_GM406889139.pdfIn PDF document text
    • https://infopromotransvision.com/ckfinder/userfiles/files/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • https://infopromotransvision.com/ckfinder/userfiles/files/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • https://infopromotransvision.com/ckfinder/userfiles/files/coin-master-hack-tool-exe_GM406889139.pdfIn PDF document text
    • https://infopromotransvision.com/ckfinder/userfiles/files/minecraft-redeem-code-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a72.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A72 24560 bytes
SHA-256: c8dd60d970feff235008c3b491e1349788044a75ea967055c054ea67d9decce8
font_01_sfnt_off000082f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82F5 4072 bytes
SHA-256: 4bd8a6a94b85f0995b18fca4131a9a9e00ccdba97b9b1ee7678b97d96e4ad269
font_02_sfnt_off000090db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90DB 2788 bytes
SHA-256: 6fd7c7f447d66842f81aa8cf197935b17f22157d0c7e9f95622df1b5b4ddf530
font_03_sfnt_off00009acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9ACB 17716 bytes
SHA-256: 777b684355b1eef5a972c4758674727e521bcb83e374608eb379fd1ca070469a

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