Malicious PDF — malware analysis report

Static analysis result for SHA-256 c953362f1ad8944c…

MALICIOUS

PDF

33.2 KB Created: 2021-07-05 04:53:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 15c33f3b4d32c52865aa8ea18bceaf90 SHA-1: 162a743f70171e105cd5b49495c87a801599d6aa SHA-256: c953362f1ad8944c36763ddeae8edc88fa4cf021bd9e16e68c9d51ffd55062a2
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors and infrastructure, disguised as "free generators" or "hacks" for popular games. The heuristic firings indicate that the document is designed to lure users into clicking these links, which likely leads to the download of a second-stage payload or further malicious activity. The presence of a "password-protected archive" lure suggests an attempt to bypass security controls by encrypting the malicious content.

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.tw/app/406889139/free-spin-appscoin-master-game-hack In PDF document text
    • http://library.ulb.ac.id/repository/coin-master-facebook-hack_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/greenwood-roblox-como-consegir-free-vip_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-free-spins-2021-today_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/no-promoise-cheat-codes-roblox-id_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/what-happens-when-you-are-reported-for-hacking-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/send-me-500-2021-spins_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/roblox-password-hacker_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/ios-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-cothes-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-free-body_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-playstation-4-free_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/minecraft-windows-10-key-free_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-admin-hack-no-dll_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/robux-giver_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-coloring-pages-for-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-coin-master-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-scp-site-61-hack_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/real-free-robux-generator_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
font_00_sfnt_off00002cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CB4 22568 bytes
SHA-256: d7bfca647c82202ceb63718bb38ecc2898417ed6e7b84831dc5bbbb926cacbd4
font_01_sfnt_off00005f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F29 18176 bytes
SHA-256: f98b14fa014d7e4f340675e0a40dd89d5d834238fa4c598c163f2051dae61cd0

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