Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d8cb37535742431…

MALICIOUS

PDF

48.3 KB Created: 2021-06-03 06:43:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 39e356e2b19c5021b01d3427f398538a SHA-1: b1a654262f26fc8be7ca905ffc8de6b251db294f SHA-256: 1d8cb37535742431bd7d08d33e12b449171463bacd76fa64066095adbef7eb9f
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack lure, directing users to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that align with this lure. The presence of a "password-protected archive handoff" heuristic suggests an attempt to bypass security controls by encrypting a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/479516143/minecraft-bedrock-free-server-hosting-game-hack In PDF document text
    • http://elibrary.fl.unud.ac.id/repository/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-robux-script_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-hack-unlimited-spins-and-coins-cheats_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-minecraft-bedrock-server_GM479516143.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/roblox-script-hacks_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/mcmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/minecraft-build-hacks_GM479516143.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-spins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-generator-free_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/tiktok-free-music_GM835599320.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-robux-no-email_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-free-spins-generator-no-human-verification_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/tiktok-free-up-space_GM835599320.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/hack-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/windows-10-minecraft-free-with-java_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000054fa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54FA 24996 bytes
SHA-256: 85d70c51d19832435cdeacbe87a3992ba63965583dc26b42ed2406822037d1d0
font_01_sfnt_off00008e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E2F 3092 bytes
SHA-256: 1aa0e4457f2fdbd20c643bc065edafaa683fd9dc2930c01c4492bce0fd9a7f02
font_02_sfnt_off000098db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98DB 18672 bytes
SHA-256: 5baa597ceebb7173861118a54c9708b38703675a1839245e0c8f4bf1dfc6d3a9

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