Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e5aa937cc409d6b…

MALICIOUS

PDF

39.6 KB Created: 2021-05-19 08:54:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ccffca45dc233c5f96105dfbfea26bc3 SHA-1: 206b0d5cfd77dcd05ac1849ae5f179ea5f58e42b SHA-256: 4e5aa937cc409d6bd04421ecbd3a1e14f8eab2d743f4208f00d70cdcccf6ec7f
182 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. It uses an MFA/2FA-themed lure. 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 0.9971

Heuristics 6

  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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/835599320/tiktok-free-money-game-hack PDF link annotation
    • http://educhina.mn/editor/files/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/comapp-trekfree-coin-spindaily-link-master_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/how-to-get-minecraft-for-free-on-android-device_GM479516143.pdfIn PDF document text
    • http://educhina.mn/editor/files/how-do-i-earn-robux_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/how-to-change-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/master-8-ball-pool-free-coins_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/best-free-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-spins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-robux-place_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-free-spins-link-2021-app_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/coun-master_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-spins-for-coin-master_GM406889139.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_003_off00004511.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4511 23420 bytes
SHA-256: 7289bec8aad9eac8e69780edfcb406cfa23405f2e2e3e13ec6a4fe777f94719e
font_01_sfnt_off0000799a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x799A 17832 bytes
SHA-256: 8faf8629516133b8e0ec361f5b21fb3e4d5cad2402d0d67b2bcff8da0b85f3ef

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