Malicious PDF — malware analysis report

Static analysis result for SHA-256 8194a7304bc9bc7b…

MALICIOUS

PDF

35.7 KB Created: 2021-07-03 14:45:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: e6ab01f07ea6d602e42e492af6b74cf6 SHA-1: 6eb514ed3269e39a246b79b054c03154e0a977aa SHA-256: 8194a7304bc9bc7b7c674da739380735086212b419178115c2e0f9f727337a18
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/431946152/free-script-injector-for-roblox-game-hack PDF link annotation
    • http://oca.undil.tl/repository/free-executor-roblox_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/descargar-natevangisapotato-stella-hacked-roblox_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/minecraft-dungeons-free-download-pc_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/robux-gainer_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-do-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/www-rubux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/hackear-coin-master-android_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-spin-and-coin-blogspot-com_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spins-2021-ios_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spins-link-ios_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-obby-roblox-game-real_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/cm-spin-link_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/minecraft-bedrock-client_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/download-roblox-mod-apk-hack_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000032c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32C1 23104 bytes
SHA-256: 81ce553dca27399f717807b01231adcc0c4305141753ee161812a58e9deffae8
font_01_sfnt_off0000660f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x660F 19240 bytes
SHA-256: 60f643abb4cc401a5bb401f714e50b573403c0a5ee56a915234eddcf4a7b1a28

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