Malicious PDF — malware analysis report

Static analysis result for SHA-256 21bf1d1ea9afad44…

MALICIOUS

PDF

33.1 KB Created: 2021-06-20 11:11:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: f01985340fca5529ed8b9481294fd7ee SHA-1: f7e84545b9e894323ebc8834309f5cc891322f9d SHA-256: 21bf1d1ea9afad4402f1f9b395a84c51820335b874973558fe6d9ab2817295ab
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, including one to 'netcdn.co', which are designed to lure users into downloading potentially malicious files or visiting scam websites. The presence of heuristics like 'PDF_SEO_LINK_FARM' and 'SE_PASSWORD_ARCHIVE_LURE' indicates a pattern of distributing links to exploit user interest in game hacks and cheats, likely as a method to distribute malware or conduct phishing. No scripts were extracted, but the embedded URLs and document content strongly suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/get-free-hero-animation-roblox-game-hack PDF link annotation
    • https://pustaka.widyakartika.ac.id/repository/how-to-hack-into-anyones-roblox-2021_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/cheats-on-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-code-for-huge-cat-pet-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-hack-spins-apk_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-vip-server-roblox-any-game_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/when-was-minecraft-free_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/websites-for-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-to-get-100-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-do-you-get-roblox-money_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-free-spins-2021-app-download_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/roblox-high-school-cheat-engine_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/minecraft-hacks-xbox_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/roblox-hack-scripts-pastebin_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/jailbreak-hack-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-online-hack-tool_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/wurst-112_GM479516143.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_off00002ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BA3 22040 bytes
SHA-256: 323bd87f10529a9b567083f393df32fa266e5f0a6c1934f9bf44bb9757a142c0
font_01_sfnt_off00005c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C68 19132 bytes
SHA-256: 983a308ee3fb090792ba4b90e3da5ec98a7471e4448a0d857eba934ceea6be49

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