Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cfbc34e8b451619…

MALICIOUS

PDF

34.3 KB Created: 2021-07-07 13:23:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 7899b9e5aa1ec6377896ceaddc84e0eb SHA-1: ed18076002bd1cf434afe854ebd7da8913615432 SHA-256: 4cfbc34e8b451619f064a3c6625842d2751439687f06d63190271329c5ff536e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to known malicious infrastructure, specifically promoting 'free generator / game hack' lures. The ML classifier also flagged this PDF with high confidence. While no scripts were extracted, the embedded URLs and the nature of the lures suggest an attempt to trick users into visiting malicious sites, likely for credential harvesting or further malware delivery.

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/free-spins-coin-master-links-game-hack In PDF document text
    • http://www.gzsuihe.com/Public/upload/editorfiles/free-robux-mod-apk_GM431946152.pdfIn PDF document text
    • http://www.gzsuihe.com/Public/upload/editorfiles/roblox-free-download-google-play_GM431946152.pdfIn PDF document text
    • http://www.gzsuihe.com/Public/upload/editorfiles/minecraft-free-download_GM479516143.pdfIn PDF document text
    • http://www.gzsuihe.com/Public/upload/editorfiles/free-minecraft-server-maker_GM479516143.pdfIn PDF document text
    • http://www.gzsuihe.com/Public/upload/editorfiles/ww-roblox-come_GM431946152.pdfIn PDF document text
    • http://www.gzsuihe.com/Public/upload/editorfiles/free-robux-hack-com_GM431946152.pdfIn PDF document text
    • http://www.gzsuihe.com/Public/upload/editorfiles/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://www.gzsuihe.com/Public/upload/editorfiles/bloxmarket-free-robux_GM431946152.pdfIn PDF document text
    • http://www.gzsuihe.com/Public/upload/editorfiles/how-to-get-a-headless-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.gzsuihe.com/Public/upload/editorfiles/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • http://www.gzsuihe.com/Public/upload/editorfiles/roblox-exploit-hack-october-2021_GM431946152.pdfIn PDF document text
    • http://www.gzsuihe.com/Public/upload/editorfiles/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://www.gzsuihe.com/Public/upload/editorfiles/how-to-patch-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://www.gzsuihe.com/Public/upload/editorfiles/spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://www.gzsuihe.com/Public/upload/editorfiles/free-codes-giftcards-robux_GM431946152.pdfIn PDF document text
    • http://www.gzsuihe.com/Public/upload/editorfiles/coin-master-free-coin-hack_GM406889139.pdfIn PDF document text
    • http://www.gzsuihe.com/Public/upload/editorfiles/free-robux-money-2021_GM431946152.pdfIn PDF document text
    • http://www.gzsuihe.com/Public/upload/editorfiles/script-lua-roblox-hack-github_GM431946152.pdfIn PDF document text
    • http://www.gzsuihe.com/Public/upload/editorfiles/free-roblox-followers-2021_GM431946152.pdfIn PDF document text
    • http://www.gzsuihe.com/Public/upload/editorfiles/free-apk-mod-coin-master_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_off0000319e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x319E 22388 bytes
SHA-256: 870e516dc7f762ccfecb70e5a0d5f0202b1c4a6974988f69828c6cfabfdbaff0
font_01_sfnt_off0000632a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x632A 18344 bytes
SHA-256: bbd45a100c9fda56c98402c01c945e99ba5b23a8a144929349c4b2a582275d64

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