Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5715774d2130bb…

MALICIOUS

PDF

44.6 KB Created: 2021-06-03 06:18:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 156867411306e5c6f222ca2e0fb63fb0 SHA-1: aafbb42db410d417b6a8152c30779f5671b3a84d SHA-256: 5b5715774d2130bb8bbd1b67a83a3dcd9066e6d1656149e4508c46733571b69e
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are structured as SEO link farms for game-related cheats and hacks. The document body and heuristics indicate a lure for game currency or hacks, and the ML classifier strongly suggests malicious intent. The presence of embedded URLs and the link farm structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/406889139/coin-master-free-spins-link-haktuts-game-hack PDF link annotation
    • http://windhorsetrek.com/userfiles/files/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-cheat-codes_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/roblox-how-to-get-free-clothes_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/pubg-uc-myanmar_GM1330123889.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-unlimited-spin-apk-free-download_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/roblox-builders-club-free_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/robux-codes-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/ios-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-app-for-free-spins_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-online-generator-for-coin-master_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-free-spins-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/how-to-get-minecraft-realms-for-free_GM479516143.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/daily-coin-master-free-spins_GM406889139.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
stream_004_off0000529e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x529E 24868 bytes
SHA-256: 0eb10e65a90d74d7665676726b354a3f3475db2f0fa8000574e6d4e2c1c7c21d
font_01_sfnt_off00008c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C0D 18196 bytes
SHA-256: eb68412a5a29c5f9d32166ea1c088a3633bd83aa56bb1cc61b9cdf84101bb097

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