Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1c76745d32cc45…

MALICIOUS

PDF

41.4 KB Created: 2021-05-19 23:48:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c5c7aa0d57937588bb88febe3b011eb2 SHA-1: c83e75fc5f24d04b556bbe6dcd24c7660212d58c SHA-256: ac1c76745d32cc45e81eeed185b4148c16406ab1b76245dbf9285656adbe0360
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-hack-facebook-game-hack PDF link annotation
    • http://www.oden.vn/upload/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.oden.vn/upload/files/coin-master-admin-free-spins_GM406889139.pdfIn PDF document text
    • http://www.oden.vn/upload/files/oginject-co_GM406889139.pdfIn PDF document text
    • http://www.oden.vn/upload/files/roblox-redeem-codes-free_GM431946152.pdfIn PDF document text
    • http://www.oden.vn/upload/files/coin-master-free-spins-link-download-for-iphone_GM406889139.pdfIn PDF document text
    • http://www.oden.vn/upload/files/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://www.oden.vn/upload/files/coin-master-free-spins-links-2021_GM406889139.pdfIn PDF document text
    • http://www.oden.vn/upload/files/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://www.oden.vn/upload/files/www-rbx-com_GM431946152.pdfIn PDF document text
    • http://www.oden.vn/upload/files/real-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://www.oden.vn/upload/files/free-roblox-pin-codes_GM431946152.pdfIn PDF document text
    • http://www.oden.vn/upload/files/free-coin-spin_GM406889139.pdfIn PDF document text
    • http://www.oden.vn/upload/files/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.oden.vn/upload/files/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.oden.vn/upload/files/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.oden.vn/upload/files/coin-master-daily-free-spins-today_GM406889139.pdfIn PDF document text
    • http://www.oden.vn/upload/files/how-to-make-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.oden.vn/upload/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.oden.vn/upload/files/coin-master-free-stuff-links_GM406889139.pdfIn PDF document text
    • http://www.oden.vn/upload/files/open-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_003_off00004726.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4726 25776 bytes
SHA-256: 51a6144da1b8845aab1137eedef5184a5a79899cf5f442c1f5ac99d330d54727
font_01_sfnt_off00008045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8045 18040 bytes
SHA-256: a8842bd0617fa86dd082827eea584dec3a7ee10a35fb1e5666a6d76cd5718c44

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