Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc89cf565ccf31b…

MALICIOUS

PDF

42.7 KB Created: 2021-05-15 01:41:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 65b5d07c90cc5208d9bddca66b51743c SHA-1: 6bc1ac7dc3ed69878eaab38d4e39686b9aea9f87 SHA-256: cdc89cf565ccf31b086e524180605cf80a8848bef203d934aa858fbc2f1d5b2d
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/free-daily-spins-coin-master-2021-game-hack PDF link annotation
    • https://elearning.mtsnsamarinda.sch.id/__statics/gudangsoal/files/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnsamarinda.sch.id/__statics/gudangsoal/files/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnsamarinda.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnsamarinda.sch.id/__statics/gudangsoal/files/free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnsamarinda.sch.id/__statics/gudangsoal/files/roblox-generator-com_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnsamarinda.sch.id/__statics/gudangsoal/files/fake-robux-codes_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnsamarinda.sch.id/__statics/gudangsoal/files/free-robux-no-password_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnsamarinda.sch.id/__statics/gudangsoal/files/coin-master-invite-friends-free-spins_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnsamarinda.sch.id/__statics/gudangsoal/files/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnsamarinda.sch.id/__statics/gudangsoal/files/apk-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnsamarinda.sch.id/__statics/gudangsoal/files/minecraft-maps-pe-free-download_GM479516143.pdfIn PDF document text
    • https://elearning.mtsnsamarinda.sch.id/__statics/gudangsoal/files/coin-master-free-coins-cheat_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnsamarinda.sch.id/__statics/gudangsoal/files/7-year-old-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnsamarinda.sch.id/__statics/gudangsoal/files/free-coins-and-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnsamarinda.sch.id/__statics/gudangsoal/files/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnsamarinda.sch.id/__statics/gudangsoal/files/is-minecraft-free-on-ps4_GM479516143.pdfIn PDF document text
    • https://elearning.mtsnsamarinda.sch.id/__statics/gudangsoal/files/roblox-arsenal-hacks-download_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnsamarinda.sch.id/__statics/gudangsoal/files/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnsamarinda.sch.id/__statics/gudangsoal/files/cute-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnsamarinda.sch.id/__statics/gudangsoal/files/how-to-get-1-million-robux-for-free-2021_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_003_off00004af2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AF2 24708 bytes
SHA-256: 6ff10eb460e50727e3434985eb9eacb9162ac7d4d131bd92ac54ab0511f11496
font_01_sfnt_off00008339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8339 18708 bytes
SHA-256: c65851a3c2ccf8ba249fbb480ab00bab2dc65c52c70fe6f18183c59a9b34b022

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