Malicious PDF — malware analysis report

Static analysis result for SHA-256 45dea4be82383e4b…

MALICIOUS

PDF

43.3 KB Created: 2021-05-17 12:13:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5b84e9ca1a8402a6a5c580ddbdd92c16 SHA-1: 43b4c40b8669aae7f2cf6362855a64990419a894 SHA-256: 45dea4be82383e4bc8122e81bf96f280d48af434720ca0cb2c771994d4a90a9d
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are presented as 'free generators' or 'hacks' for popular games. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a link farm designed to attract users with deceptive lures. The 'SE_SECRET_RECOVERY_LURE' heuristic further suggests that the document may attempt to trick users into revealing sensitive information like private keys or passwords under the guise of account recovery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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/hack-coin-master-spin-game-hack PDF link annotation
    • https://ourlady-elearning.com/userfiles/files/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/legit-coin-master-hack-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-robux-safe_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/instagram-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-spin-app-coin-master_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/robux-game_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/toolbox-for-minecraft-pe-mod-apk_GM479516143.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/wurst-client-download_GM479516143.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-spins-and-coins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/roblox-hack-download_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-hacksco_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/roblox-arsenal-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/how-to-hack-peoples-roblox-accounts_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
stream_003_off00004c64.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C64 26204 bytes
SHA-256: ac3ee712ebb0ae42845d416e17f63a299ac4a28f64716e1d554548e1319984cc
font_01_sfnt_off00008847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8847 17892 bytes
SHA-256: 63d687d2565a339edd62320ef6ccf5acbe4aebbc1e54fe1d95ecff851c8744a5

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