Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dc7be592014bd9d…

MALICIOUS

PDF

33.7 KB Created: 2021-07-05 21:31:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 45636cb5fd18d05e015b78ec098e084a SHA-1: 765d9c99b34e24d6cb4684d22fc185ff9306c3a9 SHA-256: 2dc7be592014bd9d2f52c75c148714b2a6d5fa61aab81ff1d6b92ec0b5795243
220 Risk Score

Malware Insights

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

This PDF document contains numerous links designed to lure users into clicking on "free generator" or "game hack" lures. The primary link redirects to known malicious infrastructure, and the document body itself contains a large number of SEO-optimized PDF links pointing to similar scam content. The ML classifier strongly indicated maliciousness, and the overall pattern suggests a phishing or scam campaign.

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/431946152/robux-free-robux-game-hack In PDF document text
    • http://librarysenior.com/repository/how-to-get-free-minecoins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/minecraft-windows-10-edition-hacks_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/free-400-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/how-to-get-free-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-hack-version-apk-download_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-free-spins-links-app_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/roblox-redeem-card-codes-free_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/roblox-army-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-free-spin-generator-without-human-verification_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/extra-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/easy-robux-hack_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/how-to-change-your-name-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-hack-apk-app_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/is-coin-master-free_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/free-robux-exe_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/how-to-start-a-minecraft-server-for-free_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_off00002e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E7A 22348 bytes
SHA-256: 23f23acb07140dc4710a74fbbada2832206ee165f3e052663529f92b033146f2
font_01_sfnt_off00005fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FBF 18716 bytes
SHA-256: 776cb4e5338264d595c967a8fec9379201c9a4b17293b3c44edd5cf6cd499e31

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