Malicious PDF — malware analysis report

Static analysis result for SHA-256 87250e1cde754e9b…

MALICIOUS

PDF

35.0 KB Created: 2021-07-05 07:53:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 511907b660e826d4f9a6b7f9ca589cad SHA-1: 0c7935fd2c665fbbefc7cecfca36770b2512482f SHA-256: 87250e1cde754e9b634c0eefe43053183998fa7e3bc5dc8add7bcb144aa79acd
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free generators'. The document body and heuristics indicate a lure for users to download potentially harmful content. While no scripts were explicitly extracted, the nature of the links and the 'password-protected archive' heuristic suggest a payload delivery mechanism.

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/coin-master-for-pc-free-download-game-hack In PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/roblox-shionbi-life-max-lvl-hack-robloxdaily_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/how-to-cheat-on-roblox-with-cheat-engine_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/roblox-got-talent-piano-hack_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/coin-master-free-spins-generator-no-verification_GM406889139.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/free-roblox-old-accounts_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/how-to-hack-any-account-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/good-free-items-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/coin-master-latest-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/free-promo-codes-roblox-july-2021_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/minecraft-hack-client-18-9_GM479516143.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/free-robux-generator-2021-ad_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/speed-hack-download-roblox_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/how-to-get-synapse-x-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/roblox-valkyrie-helm-free_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/tp-hack-roblox-execute-command_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/how-to-get-free-snacks-in-coin-master_GM406889139.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
stream_002_off00003103.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3103 23084 bytes
SHA-256: 370cc2f7d597470e8ddeb1d0413fbba8cfb2ff2fc1343c151d9ce36f12e856bf
font_01_sfnt_off00006507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6507 18732 bytes
SHA-256: 9039d7237ea7013513b5d91e56d3c21495662b50b782ab39a95511540a413671

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