Malicious PDF — malware analysis report

Static analysis result for SHA-256 a65cc1ae1ac3c513…

MALICIOUS

PDF

42.5 KB Created: 2021-05-17 01:54:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e405230d54bb61eaab0e3a069fa35c14 SHA-1: 0941f0171504f4b41b2a2ed058513f273e4ec608 SHA-256: a65cc1ae1ac3c5138c65ce85cf83fd62ea7ae4a378a2d570988f3c13053a9f4b
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA 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 0.9971

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 CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/431946152/robux-match-game-hack PDF link annotation
    • http://killebergsridsport.se/images/legit-coin-master-hack-october-2021_GM406889139.pdfIn PDF document text
    • http://killebergsridsport.se/images/roblox-games-with-free-radio_GM431946152.pdfIn PDF document text
    • http://killebergsridsport.se/images/coin-master-free-spins-usa-2021_GM406889139.pdfIn PDF document text
    • http://killebergsridsport.se/images/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://killebergsridsport.se/images/coin-master-admin-free-spins_GM406889139.pdfIn PDF document text
    • http://killebergsridsport.se/images/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://killebergsridsport.se/images/free-coins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://killebergsridsport.se/images/free-robux-script_GM431946152.pdfIn PDF document text
    • http://killebergsridsport.se/images/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • http://killebergsridsport.se/images/coin-master-game-android-free-download_GM406889139.pdfIn PDF document text
    • http://killebergsridsport.se/images/roblox-free-download_GM431946152.pdfIn PDF document text
    • http://killebergsridsport.se/images/withdraw-robux_GM431946152.pdfIn PDF document text
    • http://killebergsridsport.se/images/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://killebergsridsport.se/images/coin-master-new-link-free-spin_GM406889139.pdfIn PDF document text
    • http://killebergsridsport.se/images/free-roblox-com_GM431946152.pdfIn PDF document text
    • http://killebergsridsport.se/images/free-robux-safe_GM431946152.pdfIn PDF document text
    • http://killebergsridsport.se/images/how-to-get-unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • http://killebergsridsport.se/images/httpswwwurcouponsdealcom202103coinmasterfreespinandcoinlinkshtml_GM406889139.pdfIn PDF document text
    • http://killebergsridsport.se/images/coin-master-free-pet-food_GM406889139.pdfIn PDF document text
    • http://killebergsridsport.se/images/free-minecraft-bedrock-server_GM479516143.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_off000049b5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49B5 24892 bytes
SHA-256: 7430c87aaed7685a143a23443bc8e152aa5bd3347baa720fda71f990a948095f
font_01_sfnt_off00008304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8304 18544 bytes
SHA-256: 4865ec158f9470bac4731bc6ea4e87b30e3d93ae422e073d270352522cf355fc

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