Malicious PDF — malware analysis report

Static analysis result for SHA-256 374a130e613c1a09…

MALICIOUS

PDF

57.7 KB Created: 2021-06-04 02:56:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 969cb1fc6c47961bf2c363a13441c54d SHA-1: cdd271db66a4d052dbac486e72a70cd157a90da9 SHA-256: 374a130e613c1a09db650c34ef970eb08448f03a0c3e35d1ccd3ff69fc3cb06d
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 0.9684

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.online/app/406889139/how-to-find-coin-master-free-spin-link-game-hack PDF link annotation
    • http://pustaka.keperawatan.unand.ac.id/repository/coin-master-game-free-spin-download_GM406889139.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/www-free-robux-com_GM431946152.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/coin-master-free-coins-and-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/minecraft-windows-10-key-free_GM479516143.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/minecraft-java-edition-download-free_GM479516143.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/coin-master-free-download-for-pc_GM406889139.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/pokemon-go-free-98-iv_GM1094591345.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/roblox-com-redeem_GM431946152.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/minecraft-modded-client_GM479516143.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/coin-master-hack-apk-download-latest-version_GM406889139.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/aimbot-download-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://pustaka.keperawatan.unand.ac.id/repository/coin-master-free-daily-spins-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005347.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5347 27056 bytes
SHA-256: 3b7d5d5ece17860effdb8853cffe33031df0b230f3ab9825abfc54dd8a697f94
font_01_sfnt_off000091ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91EE 3088 bytes
SHA-256: 21947db80f63681192ff4d23c9293372afcdd8455d0079c5ca62ec2c2320d79e
font_02_sfnt_off00009cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9CB9 7960 bytes
SHA-256: cf7ae5cf6bef3222f5a26bec705b492fed0278aec6b16ec101aeda46e0edd2b2
font_03_sfnt_off0000afde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDE 18396 bytes
SHA-256: 92c8e769ce3efc703fa08269aba1ffc4fef719fbc8001ed724dd295d1de288f9
font_04_sfnt_off0000d236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD236 4272 bytes
SHA-256: fac9a06ceb5574feb8580c075df3ef69dfbd0efa4947186cfe90f11b68eaafb0

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