Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f34e8821f41281…

MALICIOUS

PDF

42.9 KB Created: 2021-06-03 08:12:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 6b19e6682feb52240e562fce7828d17c SHA-1: 549854c3e1e1aea30b21a411d4e3a4d5be4fae7e SHA-256: 91f34e8821f41281a6d0fa74d29d27a6ccf0c92b4ba7745eff862bd70fedf167
160 Risk Score

Malware Insights

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

This PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generators' and 'game hacks' for popular games. The ML classifier strongly flagged this PDF as malicious, and the embedded URLs are associated with known malicious redirectors. The document's content and structure suggest a phishing or scam attempt designed to lure users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

Heuristics 4

  • 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.
  • 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/406889139/coin-master-tiradas-gratis-link-game-hack In PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/minecraft-free-minecraft_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-robux-app-real_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-free-spins-a2z-help_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-downloads-for-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/hack-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-become-pubg-uc-seller_GM1330123889.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/coin-master-32-hack-apk_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/clean-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/toolbox-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://lib.smklabor.sch.id/repository/how-to-get-free-roebucks-on-roblox_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
stream_004_off00004dcb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DCB 25252 bytes
SHA-256: 392975494f99d5b5ce56137faa08ac98f3a588f6e8a4a0fe873c64264a612fb7
font_01_sfnt_off000085db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85DB 17888 bytes
SHA-256: 7e3d0d6e3169ec9d1b4a39f1a8de513868e09ebca0bcabadf274b5e058877262

Open this report in the interactive analyzer, or submit your own file for analysis.