Malicious PDF — malware analysis report

Static analysis result for SHA-256 74e58c7dd8674db4…

MALICIOUS

PDF

34.6 KB Created: 2021-07-06 06:21:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 19239415043e58ae986f0af0ace3f6ae SHA-1: 150a6a21bc46bf11b6b7cac125718e6ab254ee9c SHA-256: 74e58c7dd8674db46939cd96283a81cfd67febfd86228bab873b601be26c23dc
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 0.9980

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 http://netcdn.tw/app/835599320/free-tiktok-accounts-game-hack PDF link annotation
    • http://chem.ipb.ac.id/kim/repository/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/how-to-get-more-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/photostar-hack-client-inject-error-roblox_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-draw-2-roblox_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/roblox-hacks-vermillion_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-card-link-coin-master_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-free-spins-link-cheat_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/online-hacking-tricks-coin-master_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-hack-2021-android-apk_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-spins-and-coins-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-free-spins-deutsch-download-ios-link_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/minecraft-toolbox-premium-apk_GM479516143.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-game-hunter_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-private-server-roblox_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/working-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/daily-free-spins-and-coins-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_002_off00002fe7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FE7 23412 bytes
SHA-256: f37b5c4731d1c367bb9075e0fc700393b0afe93665bbe38c3da4b4655eec7d14
font_01_sfnt_off000064f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64F4 18112 bytes
SHA-256: 774d6147ebe616fdf354a1aaf563624e9ddd0922deb4a5b2bb6d029eb0ad17b7

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