Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2ef530b5b72627d…

MALICIOUS

PDF

46.0 KB Created: 2021-06-03 11:57:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 43678ab1674b88f56d37ebd4369a2601 SHA-1: 5249f688ea492732b9ea0199ec717161bd24653f SHA-256: b2ef530b5b72627d42d45cad2163179789ba7ec078e84fbe7a1798acab263dd2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to a malicious domain, masquerading as a 'free generator / game hack'. The document body text and heuristic firings indicate a lure for game-related currency, likely to trick users into visiting a malicious site. No scripts were extracted from this sample, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/431946152/robux-free-2021-game-hack In PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-roblox-accounts-generator_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/facebook-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-spins-coin-master-links-no-human-verification_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/how-you-get-robux_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-working-hack_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-free-pet-food-links_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-spin-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-village-cost_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/how-to-make-a-roblox-group-for-free_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/pig-master-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/aristois-minecraft-hack_GM479516143.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-free-spins-apk_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_off0000502f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x502F 27792 bytes
SHA-256: 40a0c39b7c877cd6a40472f0b0ac3472f6117d380c024396b6ebe81e4555cb67
font_01_sfnt_off000090ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90AD 18416 bytes
SHA-256: 1a644f5289783458eb76ac5741ebd0afe9ba6d8f40911ca8ddb4573f3c6c1b2f

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