Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff098ef1ceeb36e…

MALICIOUS

PDF

36.7 KB Created: 2021-07-04 12:07:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 841213effc36404540754506dbf32209 SHA-1: 34ce26d8852f86f738e0d8da23a3015fe729b91c SHA-256: fff098ef1ceeb36e399d36c3dc08117febd4f56d97e9a8565517855322efb0e0
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed as a lure, employing a 'free generator' or 'game hack' theme to entice users. It contains numerous links, including one pointing to known malicious redirector infrastructure at http://netcdn.tw/app/406889139/coin-master-free-spins-daily-link-updated-game-hack. The document also functions as a link farm, directing users to a large number of other PDF documents hosted on collectionsuncovered.com, likely for SEO manipulation or to distribute further malicious content.

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/coin-master-free-spins-daily-link-updated-game-hack In PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/minecraft-free-apk_GM479516143.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/how-to-hack-someones-roblox-account-on-pc_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-32-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/how-to-hack-robux-easy_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-free_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-roblox-codes-2021-no-human-verifivation_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-robux-real_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/pokemon-go-free-online_GM1094591345.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-minecraft-codes-2021_GM479516143.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/install-coin-master_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/coin-master-spin-hack-app_GM406889139.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://collectionsuncovered.com/media/storage/editor/files/how-to-get-infinite-robux_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_off000037fa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37FA 22824 bytes
SHA-256: 304822490be7da6b5b34a6f3967539c38888e3a4f50b6edfef0308fa57adab19
font_01_sfnt_off00006a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A93 19128 bytes
SHA-256: 2140352465974415e356fb4466e0de00f5c4596de6cfd7dfe4c3405bd42c3af0

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