Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b874d8e97c58a1…

MALICIOUS

PDF

35.5 KB Created: 2021-06-30 09:51:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 13d3d633150ba5c5e777ba24886585e7 SHA-1: 92dc680d3ddd3b64a5aa6300da331394adcc773e SHA-256: 18b874d8e97c58a1161ace472f7d5b16c5fa9418307ae86bc40166bd05df72ff
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free generators' for popular games. The primary lure URL is http://netcdn.co/app/431946152/how-to-make-vip-server-for-free-in-roblox-game-hack, which is flagged as a malicious redirector. The document body and embedded URLs reinforce this lure, suggesting a phishing or scam attempt to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/how-to-make-vip-server-for-free-in-roblox-game-hack In PDF document text
    • http://lib.fekon.untad.ac.id/repository/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/script-hack-bloxburg-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/coin-master-free-pet-food_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/roblox-flee-the-facility-cheats_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/imba-tools-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-robuxcom-real_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/coin-master-spins_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-printable-roblox-coloring-pages_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/roblox-free-robux-codes-http-bitly-robloxinstantapp_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/get-robux-free-scrach_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-roblox-download-for-windows-10_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-roblox-groups_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-robux-exe_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-to-get-free-exotics-in-roblox-assassin_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-to-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-roblox-gift-card-26-11-2021_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/black-adidas-t-shirt-roblox-free_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_002_off00003194.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3194 22568 bytes
SHA-256: 5098cd0e130e57a3ee868fddcd79d4751a93225ded72a3d63dd87f0950cb0c66
font_01_sfnt_off000063fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63FC 19724 bytes
SHA-256: ec889b1c9a1281230a27a94fbf05209d3bef66a3ba30de807b9eb13856d2e252