Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c8a3f68d0fe5dc…

MALICIOUS

PDF

46.6 KB Created: 2021-06-03 23:24:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ffa404ac669629a42d09611c7ba2d817 SHA-1: 464c86ba3f9d481d69b6ae15d39a1ef740494736 SHA-256: c8c8a3f68d0fe5dcd8fefa3fc192be1aec58b9f5f8dbd7d8d139e2768109d52f
200 Risk Score

Malware Insights

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

This PDF document contains multiple links to known malicious redirectors, disguised as 'free generator' or 'game hack' lures. The document body and embedded URLs suggest an attempt to trick users into visiting malicious sites, which likely host further exploits or phishing content. The presence of a download button lure and password protection instructions further supports a malicious workflow designed to bypass security controls and deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/431946152/free-robux-generator-no-human-verification-or-surveys-game-hack In PDF document text
    • https://library.stikeswnpalu.ac.id/repository/pubg-uc-wholesale_GM1330123889.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/roblox-hack-client_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/minecraft-free-download-pc_GM479516143.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/free-minecraft-windows-10-with-java_GM479516143.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/free-account-roblox-2021_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/www-cheatsk-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/how-can-i-get-robux_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/coin-master-free-spins-through-coin-pop_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/coin-master-hack-pro-gamers-com_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/pokemon-go-free-candy-hack_GM1094591345.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/lastrick-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/free-pet-food-on-coin-master_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/free-minecraft-java-account_GM479516143.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_off000051bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51BB 27736 bytes
SHA-256: cbc3d6e443ac601ed5f8e1b70c509991b2052808fa2bd5ecb57daf8d72f1dd15
font_01_sfnt_off00009126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9126 19156 bytes
SHA-256: b23a4dbd5b2cf0eeb4dbb5626642de4de2979fce29ecd3df28c5d1ef95471ce4

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