Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9cff32005f692fe…

MALICIOUS

PDF

36.7 KB Created: 2021-07-06 03:23:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9a5076bc1c33de9147751d35e821ec52 SHA-1: 39deb4f9cf54b0a3eff4f2de44a036472417dc7c SHA-256: d9cff32005f692fe9851dc655508b766718639287bb5784e692c16bdf8d1d00f
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external sites, including a known malicious redirector at http://netcdn.tw/app/406889139/legit-coin-master-hack-site-zyngaplayerforumscom-game-hack. It also features a link farm with many URLs pointing to PDF files, likely for SEO manipulation or to host further malicious content. The presence of a 'download button' lure reinforces the deceptive nature of the document, aiming to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/legit-coin-master-hack-site-zyngaplayerforumscom-game-hack In PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/roblox-robux-hack-1-easy-step_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/da-hood-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/coin-master-hacks-no-downloading_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/cheat-codes-for-pokemon-galaxy-roblox_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/guess-that-song-game-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/hack-coin-master-download-ios_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/roblox-hack-copy-and-paste_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/roblox-free-2021-robux_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/comptes-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/code-code-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/does-robux-hacknet-work_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/how-to-get-free-robux-ipad-only-2021-youtube_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/how-to-get-free-robux-2021-no-hack-or-download_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/free-robux-mobile_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/coin-master-free-spins-link-app-download_GM406889139.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_off0000363b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x363B 23380 bytes
SHA-256: b1f9c2e472fbba669ffa35f2dde3ab9491ce0633302f0050f1058b634d7b9e9c
font_01_sfnt_off00006b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B24 18928 bytes
SHA-256: 2d8f15398b0872070122c1c8280df31c6af84f2aed26de9ea3bfb6d3ad73ce84

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