Malicious PDF — malware analysis report

Static analysis result for SHA-256 429a6ab74d5cb531…

MALICIOUS

PDF

34.8 KB Created: 2021-07-07 03:05:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4081abc6f77a7ba25838037f6434411b SHA-1: 5116d84207f25322291406015a6d9eeb3c29591c SHA-256: 429a6ab74d5cb53154d8e33151d066192d9afd807b91f21bd318586c68bd7317
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are SEO-optimized PDFs hosted on 'edu.kyst.com.tw' and a redirector on 'netcdn.tw'. These links are presented as lures for game hacks and free in-game currency, indicating a phishing or scam attempt. The ML classifier strongly supports the malicious nature of this PDF.

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/406889139/coin-master-free-spins-and-coins-daily-game-hack PDF link annotation
    • https://edu.kyst.com.tw/image/data/files/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-accessory-bear-face-mask-in-roblox_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/easy-robux-hack_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/how-t-hack-any-roblox-game-with-scripts_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-free-spins-link-app-download_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/roblox-accounts-for-sale-free_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/open-coin-master_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/how-to-get-a-free-2021-roblox-acc_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/why-do-my-roblox-hacks-crash_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/roblox-hack-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/tiktok-free-vs-paid_GM835599320.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-cheats_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/police-sim-hack-roblox_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-hack-ios-download-2021_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-robux-tool-download-works_GM431946152.pdfIn PDF document text
    • https://edu.kyst.com.tw/image/data/files/free-robux-generator-no-survey-no-download-no-human-verification_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_off00003027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3027 22928 bytes
SHA-256: 825c720738f61723b112d2bdd86bcacff3ffd12a40a70b2cd7dc46d7b7f712ec
font_01_sfnt_off000063b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63B3 18772 bytes
SHA-256: 19a32b246d97102996ae87c3480bab741072fa74bbecf67b9c68c4bb2203f36d

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