Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb0fa129478432e…

MALICIOUS

PDF

35.5 KB Created: 2021-07-06 14:21:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 2c6c8559282d7e0bba5bb1fa50c9995e SHA-1: 90e005967189c3f98dd78d45f968a1cae07beb60 SHA-256: fdb0fa129478432ee86ec522d2ccf19cb87b9f29e90ed97fbe2e755ece1e6bbb
142 Risk Score

Malware Insights

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

This PDF document employs a common lure of free game hacks and generators to entice users to click on malicious links. The primary link, http://netcdn.tw/app/431946152/script-executor-roblox-free-game-hack, likely leads to a second-stage payload or exploit. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of similarly themed links, suggesting a broad campaign to attract victims through search engine optimization. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/script-executor-roblox-free-game-hack PDF link annotation
    • http://opac.b2p2vrp.litbang.kemkes.go.id/repository/coin-master-hack-without-verification-code-2021_GM406889139.pdfIn PDF document text
    • http://opac.b2p2vrp.litbang.kemkes.go.id/repository/free-400-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.b2p2vrp.litbang.kemkes.go.id/repository/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://opac.b2p2vrp.litbang.kemkes.go.id/repository/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://opac.b2p2vrp.litbang.kemkes.go.id/repository/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • http://opac.b2p2vrp.litbang.kemkes.go.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://opac.b2p2vrp.litbang.kemkes.go.id/repository/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://opac.b2p2vrp.litbang.kemkes.go.id/repository/how-to-get-roblox-credit-for-free_GM431946152.pdfIn PDF document text
    • http://opac.b2p2vrp.litbang.kemkes.go.id/repository/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://opac.b2p2vrp.litbang.kemkes.go.id/repository/free-game-packs-for-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.b2p2vrp.litbang.kemkes.go.id/repository/free-coin-master-stuff_GM406889139.pdfIn PDF document text
    • http://opac.b2p2vrp.litbang.kemkes.go.id/repository/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.b2p2vrp.litbang.kemkes.go.id/repository/free-roblox-wings_GM431946152.pdfIn PDF document text
    • http://opac.b2p2vrp.litbang.kemkes.go.id/repository/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • http://opac.b2p2vrp.litbang.kemkes.go.id/repository/free-minecraft-mods-for-ps4_GM479516143.pdfIn PDF document text
    • http://opac.b2p2vrp.litbang.kemkes.go.id/repository/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://opac.b2p2vrp.litbang.kemkes.go.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://opac.b2p2vrp.litbang.kemkes.go.id/repository/hack-roblox-robux-2021_GM431946152.pdfIn PDF document text
    • http://opac.b2p2vrp.litbang.kemkes.go.id/repository/coin-master-hack-spin-generator-tool_GM406889139.pdfIn PDF document text
    • http://opac.b2p2vrp.litbang.kemkes.go.id/repository/how-do-i-get-robux-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
font_00_sfnt_off00003402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3402 22272 bytes
SHA-256: 473041756e5dc9f3ec30a0dd414217aba48d69d57014d9fee0bf99e08a69f67e
font_01_sfnt_off0000658b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x658B 19192 bytes
SHA-256: f3a51fc67d8c05d2e4aad044fefa6f3423405f670f78b1fc55f86c37a2c91406

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