Malicious PDF — malware analysis report

Static analysis result for SHA-256 d79ec24d0495ae58…

MALICIOUS

PDF

33.6 KB Created: 2021-06-26 03:25:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 6c3004ab1e7a6b2771c481169a0d5740 SHA-1: dbb95dfb64fdfc8c9d333c2ee7d96f52c860f3da SHA-256: d79ec24d0495ae583239bb7051a5e2ddf6e0792d9d4c89acbe4f64c4d2030348
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs, with a primary link pointing to a known malicious redirector infrastructure. The document body and heuristics indicate a lure for game hacks, specifically targeting Roblox, to entice users to click on these links. The ML classifier also strongly flagged this PDF as malicious.

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-hack-roblox-admins-game-hack In PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/roblox-free-download-meepcity_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-flip-master-coins_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/hack-para-cbro-roblox_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/pokemon-go-free-pokeballs-2021_GM1094591345.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/old-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-robux-no-sign-up-no-survey_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/how-to-get-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/roblox-hacks-for-phantom-forces_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/links-for-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/is-there-anyway-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/money-hack-ultimate-driving-roblox_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-homepage_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-minecraft-pe-server_GM479516143.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/roblox-free-pc_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/cheat-invincible-roblox-mad-city_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/best-minecraft-hacked-client-2021_GM479516143.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-cheats-and-hacks_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
font_00_sfnt_off00002e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E25 21428 bytes
SHA-256: 02150b840f1cdb2e7b4dfbd7ffbc2aea9b3e8caa6884ca17dd6dbbfbf82b22cb
font_01_sfnt_off00005cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CF9 19376 bytes
SHA-256: ed0bee8e4f605dfcdcd907b0234e31fceb1580f94560c94a65bb1e5db2cbeb98

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