Malicious PDF — malware analysis report

Static analysis result for SHA-256 bae0fdfb9e77e80b…

MALICIOUS

PDF

44.6 KB Created: 2021-06-03 13:15:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 17ebb91cafd4e45fa23eb8f241f0b751 SHA-1: fda19b972bb595ae5ecb07ccc272e0d87f92e280 SHA-256: bae0fdfb9e77e80b690a3812bae14d4a9958d7959a63c67002633c9d11f9d7cb
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 0.9865

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/free-coins-coin-master-ios-game-hack PDF link annotation
    • http://perpus.sdmuhwirobrajan3.sch.id/repository/free-roblox-adopt-me-pets_GM431946152.pdfIn PDF document text
    • http://perpus.sdmuhwirobrajan3.sch.id/repository/level-coin_GM406889139.pdfIn PDF document text
    • http://perpus.sdmuhwirobrajan3.sch.id/repository/coin-master-free-spins-ios_GM406889139.pdfIn PDF document text
    • http://perpus.sdmuhwirobrajan3.sch.id/repository/free-robux-mod_GM431946152.pdfIn PDF document text
    • http://perpus.sdmuhwirobrajan3.sch.id/repository/coin-master-hack-spins-app_GM406889139.pdfIn PDF document text
    • http://perpus.sdmuhwirobrajan3.sch.id//repository/roblox-games-to-play-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.sdmuhwirobrajan3.sch.id//repository/coin-master-hack-without-verification-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
    • http://perpus.sdmuhwirobrajan3.sch.id/repository/coin-master-game-android-free-download_GM406889139.pdfIn PDF document text
    • http://perpus.sdmuhwirobrajan3.sch.id//repository/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.sdmuhwirobrajan3.sch.id/repository/coin-master-hack-apk-latest-version-2021_GM406889139.pdfIn PDF document text
    • http://perpus.sdmuhwirobrajan3.sch.id//repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://perpus.sdmuhwirobrajan3.sch.id/repository/free-spin-app-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.sdmuhwirobrajan3.sch.id//repository/coin-master-free-spins-deutsch-download-ios-link_GM406889139.pdfIn PDF document text
    • http://perpus.sdmuhwirobrajan3.sch.id/repository/coin-master-hack-version-download-2021-ios_GM406889139.pdfIn PDF document text
    • http://perpus.sdmuhwirobrajan3.sch.id//repository/free-robux-generator-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.sdmuhwirobrajan3.sch.id//repository/coin-master-spin-hack-trick_GM406889139.pdfIn PDF document text
    • http://perpus.sdmuhwirobrajan3.sch.id/repository/get-more-robux_GM431946152.pdfIn PDF document text
    • http://perpus.sdmuhwirobrajan3.sch.id//repository/hack-coin-master-site-rssingcom_GM406889139.pdfIn PDF document text
    • http://perpus.sdmuhwirobrajan3.sch.id//repository/coin-master-free-shield_GM406889139.pdfIn PDF document text
    • http://perpus.sdmuhwirobrajan3.sch.id/repository/coin-master-unlimited-spin-link_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_004_off000053a4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53A4 25088 bytes
SHA-256: 4b6e02ddb9f402f2bc852d5ddd44310ac5001ed747fb91bc0dc1804998706730
font_01_sfnt_off00008d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D87 17712 bytes
SHA-256: f83e072817e97c1894950a6710750dab4701111bee6087413b5c7634198f8e68

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