Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3b586abc3fe689…

MALICIOUS

PDF

42.9 KB Created: 2021-05-13 00:05:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 6cd8696233e3b2b4be184a6b59c7fab5 SHA-1: c2c709389b57c045bdcbcc323f4e85a9eaaf73ba SHA-256: 4d3b586abc3fe6896300b140d8e2d42cebcc44ee28a3eb3f635c7f47e85ddd0b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and free currency generators. The heuristic firings indicate that these links are associated with known malicious redirectors and lures for game-related scams. While no scripts were explicitly extracted, the nature of the embedded links and the lure suggest an attempt to direct users to potentially malicious websites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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-link-app-game-hack In PDF document text
    • https://www.yatrikathmandusuite.com/userfiles/files/coin-master-hack-without-verification-code-2021_GM406889139.pdfIn PDF document text
    • https://www.yatrikathmandusuite.com/userfiles/files/juego-hackeado-de-coin-master_GM406889139.pdfIn PDF document text
    • https://www.yatrikathmandusuite.com/userfiles/files/how-to-get-stuff-that-cost-coins-free-mpe-master_GM406889139.pdfIn PDF document text
    • https://www.yatrikathmandusuite.com/userfiles/files/how-can-i-get-free-coinsn-coin-master_GM406889139.pdfIn PDF document text
    • https://www.yatrikathmandusuite.com/userfiles/files/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.yatrikathmandusuite.com/userfiles/files/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://www.yatrikathmandusuite.com/userfiles/files/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.yatrikathmandusuite.com/userfiles/files/coin-master-free-spins-and-cards_GM406889139.pdfIn PDF document text
    • https://www.yatrikathmandusuite.com/userfiles/files/mcpe-com_GM479516143.pdfIn PDF document text
    • https://www.yatrikathmandusuite.com/userfiles/files/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • https://www.yatrikathmandusuite.com/userfiles/files/hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.yatrikathmandusuite.com/userfiles/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.yatrikathmandusuite.com/userfiles/files/roblox-bux-free_GM431946152.pdfIn PDF document text
    • https://www.yatrikathmandusuite.com/userfiles/files/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://www.yatrikathmandusuite.com/userfiles/files/coin-master-unlimited-spin-hack-apk_GM406889139.pdfIn PDF document text
    • https://www.yatrikathmandusuite.com/userfiles/files/robux-free-c_GM431946152.pdfIn PDF document text
    • https://www.yatrikathmandusuite.com/userfiles/files/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • https://www.yatrikathmandusuite.com/userfiles/files/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • https://www.yatrikathmandusuite.com/userfiles/files/coin-master-hack-using-cheat-engine_GM406889139.pdfIn PDF document text
    • https://www.yatrikathmandusuite.com/userfiles/files/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.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_off00004e3a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E3A 24524 bytes
SHA-256: c473f35878c6890bdee9e9a91b010d09654a3d162b9e9ae9191fbbcbab9d31cf
font_01_sfnt_off00008663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8663 17892 bytes
SHA-256: 72e692e4028f81ba8dd172a66d01e663a5789eadf11e4de559a299ee93c64d62

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