Malicious PDF — malware analysis report

Static analysis result for SHA-256 1450233128087a43…

MALICIOUS

PDF

35.7 KB Created: 2021-06-21 12:36:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 407e0ed42fadc9f242e2b04fa41bd083 SHA-1: 6b3fb742cbf02b5e9d6e52a323b622d217b4c21d SHA-256: 1450233128087a43f65e5ebefcc8a82b723281d7524a65c0de2b4134687ecbf6
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.co/app/431946152/bit-ly-free-robux-2021-game-hack PDF link annotation
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/free-tiktok-followers-no-human-verification-or-survey-2021_GM835599320.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/free-card-collection-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/coin-master-free-spins-link-2021-blogger_GM406889139.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/without-pokemon-go-free-incense_GM1094591345.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/coin-master-ultra-attack-hack_GM406889139.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/vip-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/free-100-robux_GM431946152.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/new-roblox-hack-exploit-for-murder-mystery-2_GM431946152.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/hacks-para-coin-master_GM406889139.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/free-hair-roblox-boy_GM431946152.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/how-to-know-who-is-hacking-on-roblox-killing-everyone_GM431946152.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/cheating-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/free-robux-codes-2021-no-survey_GM431946152.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/get-anything-free-catalog-roblox-pastebin_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
font_00_sfnt_off000032bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32BB 22524 bytes
SHA-256: 99b0232ff426f03f03f06c867c89d75ef9249cdeeba5936395b5ad6bd0c12195
font_01_sfnt_off000064fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64FC 19524 bytes
SHA-256: d233d5f50b19b81bfe359dd5687758bfe4656a0b2f988401bd4f5c325d9b1cb7

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