Malicious PDF — malware analysis report

Static analysis result for SHA-256 dadeefee0c6a76ef…

MALICIOUS

PDF

47.7 KB Created: 2021-06-03 08:46:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 2bae2750c514ab0e8e17fa8f2215d054 SHA-1: 40d392fe6f33937a4b429a5a554cf265d430c5ae SHA-256: dadeefee0c6a76efccacad2a39b2499d9c316921454c88f9cec39f71dd551775
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 0.9832

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/479516143/free-minecraft-server-maker-game-hack PDF link annotation
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/coin-master-invite-friends-hack_GM406889139.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/tiktok-free-hearts-hack_GM835599320.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/minecraft-wurst_GM479516143.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/coin-master-unlimited-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/how-to-get-more-followers-on-tiktok-free_GM835599320.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/do-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/coin-master-free-spins-23-march-2021_GM406889139.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/free-multiplayer-minecraft-server_GM479516143.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/is-minecraft-free_GM479516143.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/free-pe_GM479516143.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/is-roblox-free-on-nintendo-switch_GM431946152.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/buy-tiktok-followers-free_GM835599320.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/free-robux-without-human-verification_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_004_off00005784.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5784 31900 bytes
SHA-256: 609de33b8beb25790d5188e988adb6257c27ec6368a4a54010c776b701959740
font_01_sfnt_off00009977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9977 17852 bytes
SHA-256: a2113846211f941d41962086a33418b46c13efddcea93467eebdb757cad7d920

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