Malicious PDF — malware analysis report

Static analysis result for SHA-256 40eac04c4bfa7421…

MALICIOUS

PDF

35.3 KB Created: 2021-06-30 09:57:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 813ddd8b6b01e9ca1a1c338ad0efd64e SHA-1: d2418103db5b44662fc606b8852d6d11d27db679 SHA-256: 40eac04c4bfa7421d3b7ba5d9148889a7805017d402f04896647db8ec03f743a
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/free-robux-card-codes-2021-december-game-hack PDF link annotation
    • https://cnc-xinrong.com.tw/image/data/files/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-34-4-free-download_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/roblox-redeem-card-codes-free_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-spin-today-coin-master_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/roblox-extreme-hack-net_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-robux-earn_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-free-coins-and-spins-online-tool_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-spins-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-spin-coin-master-twitter_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/is-roblox-free-on-pc_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-free-spin-and-coin-link-app_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/no-human-verification_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/code-free-robux_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_off00003214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3214 22064 bytes
SHA-256: 4a89e85934e6e8d0e2d2bf99cd8ad28b81a11d2f4c9fb0fae1d56089d5739bfa
font_01_sfnt_off000062ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62EA 19720 bytes
SHA-256: 7b7ef9fc7932c68ed14209fea0101d6e31c02a4e1cb46bdfb3278d9e25f0b45c

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