Malicious PDF — malware analysis report

Static analysis result for SHA-256 bad33217ad584371…

MALICIOUS

PDF

43.5 KB Created: 2021-05-12 13:09:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: f480ca7ff8e7f118a72abe421d152f5b SHA-1: 7b7a9b4e117f799fba009e5f355ea1ec28df04fa SHA-256: bad33217ad584371efe475ea24c8cadf9b2027cf7baa8404417dcd0cd74c6a98
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses an invoice-themed lure. 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 0.9969

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/479516143/how-to-play-minecraft-for-free-on-pc-game-hack PDF link annotation
    • http://lib.baruna-husada.ac.id//repository/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.baruna-husada.ac.id//repository/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib.baruna-husada.ac.id/repository/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://lib.baruna-husada.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.baruna-husada.ac.id//repository/how-to-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://lib.baruna-husada.ac.id/repository/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.baruna-husada.ac.id//repository/how-to-get-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.baruna-husada.ac.id//repository/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://lib.baruna-husada.ac.id/repository/how-to-get-free-tokens-in-minecraft-ps4_GM479516143.pdfIn PDF document text
    • http://lib.baruna-husada.ac.id/repository/collect-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.baruna-husada.ac.id//repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://lib.baruna-husada.ac.id//repository/coin-master-free-coins-cheat_GM406889139.pdfIn PDF document text
    • http://lib.baruna-husada.ac.id/repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.baruna-husada.ac.id//repository/noob-vs-pro-vs-hacker-vs-god-minecraft_GM479516143.pdfIn PDF document text
    • http://lib.baruna-husada.ac.id//repository/coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://lib.baruna-husada.ac.id/repository/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • http://lib.baruna-husada.ac.id//repository/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.baruna-husada.ac.id//repository/free-exploits-for-roblox_GM431946152.pdfIn PDF document text
    • http://lib.baruna-husada.ac.id/repository/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.baruna-husada.ac.id//repository/roblox-free-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_off00004e10.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E10 25612 bytes
SHA-256: e8fd7d861ce4b80f1878a2086279383ec817145ea71d90e6756de8a784e0d156
font_01_sfnt_off000087bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87BF 18284 bytes
SHA-256: 805db6617afe2d237489c8bb7c2b5cc2832d34670fdae12a8b82fd0acde92e0c

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