Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de5623c368b4c6b…

MALICIOUS

PDF

34.9 KB Created: 2021-07-10 03:12:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1f2a752c5ebc44d2b49f4f6afbb95e36 SHA-1: 8f10044e1ed33dd69e56ee18321ea60223c07fb3 SHA-256: 6de5623c368b4c6b27f81a58a71bada414a815299cc47d6bcb575ca3662026ba
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of game hacks and free virtual items to trick users into clicking malicious links. The primary link directs to a known malicious redirector infrastructure, which in turn hosts further malicious PDF files. The document's content and embedded links strongly suggest a phishing or scam campaign aimed at users seeking cheats or in-game currency.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-hack-club-game-hack In PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/mcpe-optifine_GM479516143.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/free-virtual-items-codes-roblox_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/how-to-get-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/roblox-hack-download-robux-pc_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/haktuts-2021-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/hacks-master-coin_GM406889139.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/coin-master-heaven-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/cheat-engine-roblox-tycoon-money_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/coin-master-hack-version-2021-free-download_GM406889139.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/mcpe-hack-client_GM479516143.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/300-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/robux-today_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/new-how-to-get-free-robux-on-robloxon-april-2021_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/free-minecraft-windows-10-with-java_GM479516143.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/roblox-logo-t-shirt-free-shipping_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/coin-master-free-coins-and-spins-daily-summary_GM406889139.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/hacks-for-roblox-map-kat_GM431946152.pdfIn PDF document text
    • https://kalautsav.bepcssa.in/ckfinder/userfiles/files/how-to-get-free-robux-youtube_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_002_off0000327b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x327B 22816 bytes
SHA-256: 8b59f841b3b49774be079e85fb22ca09bc05b4053dfc0b8da5275ed194204d4d
font_01_sfnt_off0000657d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x657D 18376 bytes
SHA-256: dd43411f80a60a82ab72e2bc8e086b2bb22e047feb8d2d035d108791568e8130

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