Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d4347f6a5b55ed…

MALICIOUS

PDF

45.4 KB Created: 2021-05-16 06:08:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0519828732d340b803e774132179b1f5 SHA-1: a9ce7355b6ad8855b95bbd803b788d34d3c74785 SHA-256: 57d4347f6a5b55ed64b1e0d79d2f9b4a50a2bec97886a03b9ed9008b86c54b04
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 0.9507

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.xyz/app/406889139/coin-master-free-cards-link-2021-game-hack PDF link annotation
    • https://mobile.connecttravel.com.tw/image/data/files/how-to-add-mods-to-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/free-promo-codes-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/how-to-get-free-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/get-minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/lastrick-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/how-to-get-infinite-robux_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/roblox-t-shirt-free_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/how-to-change-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/haktuts-coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/minecraft-free-no-download_GM479516143.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/free-spins-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/how-do-you-get-free-robux-without-paying_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c4e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C4E 24628 bytes
SHA-256: 40f7453d4266a7f355ae421acc2699aa6de2d7c37ecdcbb2863dc5a87e63d5c4
font_01_sfnt_off00008420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8420 2928 bytes
SHA-256: 64242521e32848fe2434190b0c7414fcd492221a3cc2972c66f57f4842775e11
font_02_sfnt_off00008e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E3D 18456 bytes
SHA-256: b51790488d60a3c79421cfddad0a6ae9f074b26b8d27a704dda1d2d7bad48ec0

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