Malicious PDF — malware analysis report

Static analysis result for SHA-256 661bd803fc60edeb…

MALICIOUS

PDF

34.8 KB Created: 2021-06-28 02:01:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: cc01a471187feb311975de22d6305975 SHA-1: dd6ec4a61e3efd4d6d1a13438b2bf9b8ca58e869 SHA-256: 661bd803fc60edeb2b4f2dd72d397ade07234a21c9a1411f1221ffd518ce2460
200 Risk Score

Malware Insights

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

This PDF document contains multiple links to a known malicious redirector, masquerading as a game hack generator. The document body and heuristics indicate a lure for users to click these links, likely to download a second-stage payload. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/veil-roblox-hack-paid-game-hack In PDF document text
    • https://opac.umrah.ac.id/repository/minecraft-for-chromebook-free_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/crate-opening-roblox-hack_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/minecraft-free-no-download_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-play-free-draw-alpha-2-on-roblox_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/hacks-for-mad-city-roblox_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coinmaster-hack_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-get-minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/minecraft-pe-free-download-ios_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-free-spins-iphone-2021_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/today-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-legit_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/comapp-trekfree-coin-spindaily-link-master_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/hack-roblox-in-game_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-get-free-robux-in-5-seconds_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-com-hack-password_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-use-winrar-for-hacks-roblox_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/bleach-roblox-hack_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/admin-hack-roblox-espaol_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/microsoft-roblox-rewards_GM431946152.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_off00003039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3039 22576 bytes
SHA-256: 6814cbb6cd8488b7f2a73d204207b7be4651982d0632ae3f5b4dfa553d4ed8a1
font_01_sfnt_off0000628f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x628F 19240 bytes
SHA-256: 7f2b30447bce5cc599aa5f9db2388bd314420d4b51c9c8f5ad1718140afc5f64

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