Malicious PDF — malware analysis report

Static analysis result for SHA-256 66dce86c0f39ea3a…

MALICIOUS

PDF

44.0 KB Created: 2021-06-03 12:49:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: dfa4b99046903c9e29e205c023e4d94b SHA-1: d7e1464dab6e3f7df24648f693f97b0b48d0d231 SHA-256: 66dce86c0f39ea3a9f26e51cd2e10d6d4685e61fda37b9ed92ab054b21604fe5
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple heuristics indicating it is designed to lure users with game hack promises, linking to external sites. The PDF_SEO_LINK_FARM heuristic suggests a large number of links are present, likely for SEO manipulation or to distribute further malicious content. The ML_NYX_PDF_MALICIOUS score further supports its malicious nature.

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/coin-master-hack-generator-tool-game-hack PDF link annotation
    • http://library.yamasi.ac.id//repository/free-script-executor-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-free-coins-twitter_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/how-to-get-free-spins-on-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-unlimited-coins-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/can-you-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/minecraft-pe-apk-free-download_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/minecraft-hacked-client-bedrock_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/do-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-hack-generator_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/how-to-hack-a-minecraft-account_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/mcpe-master-coins-hack-download_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/robux-codes_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-free-play-no-download_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-fan_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/10-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/how-to-get-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-coins-spins-on-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_004_off00005126.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5126 25080 bytes
SHA-256: 5b8f023ade88b14cbdb776e9ecb06af54e7691d0ba930a09bb929833d8efe883
font_01_sfnt_off00008abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ABE 17788 bytes
SHA-256: d0af5e321b19932d6b42e9931a3a503f903c8cb76e011cfe2d62e7a6e6721031

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