Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef3030ecfb02ac86…

MALICIOUS

PDF

42.6 KB Created: 2021-05-12 10:12:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 79a19c74c304cc0a76cc92f4d97795ce SHA-1: e2fe89acafaaefde6a250a26be73d9ff64e3db76 SHA-256: ef3030ecfb02ac86d059e7df45935b9716eb8b8d3ac3a0099c433194705a0b60
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-spins-on-coin-master-2021-ios-game-hack PDF link annotation
    • http://digilib.stimlog.ac.id/repository/coin-master-free-spins-2021-link_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-spins-on-coin-master-without-waiting_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coinmaster-free-spins-link_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-free-food_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-coin-master-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-coin-master-spins-links-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/minecraft-menu_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/buxblast-com-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_003_off00004a24.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A24 25116 bytes
SHA-256: c7a295ed9777dd57aed20bf240fb79fed9682b1c64188e42155cea86042dad21
font_01_sfnt_off00008446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8446 18288 bytes
SHA-256: 9fe1374c2a5f04ab05412f91fd2327b7ecdc71e8abb7b76c0a33ea1eb285afe1

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