Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de1fa9670d90104…

MALICIOUS

PDF

37.4 KB Created: 2021-07-05 14:20:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d8a920b48aad8404f293ad74dc2dcf84 SHA-1: d9dfda451362e7316603646f3e183626c885cc4b SHA-256: 4de1fa9670d901044c90bdf1dca8a868bbb49b85345d37b2d0ec0085ab40c157
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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/406889139/coin-master-tool-hack-game-hack PDF link annotation
    • http://opac.salatiga.go.id/slims7/repository/free-rich-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/master-8-ball-pool-free-coins_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/how-to-get-free-robux-on-roblox-with-inspect-element_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/how-to-make-roblox-clothes-for-free_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/roblox-free-robux-hack-2021-generator-cheat_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/free-roblox-adopt-me-accounts_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/how-do-you-get-free-robux-on-ipad-mini_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/roblox-trolling_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/roblox-bubble-gum-simulator-steal-hack_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/free-robux-no-scam-or-verification_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/coin-master-free-spins-ios-app_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/synapse-roblox-free_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/hack-dragon-ball-onliine-revolution-roblox_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/coin-master-hack-app-ios_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/roblox-ninja-warrior-hack_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/como-conseguir-robux-en-roblox-sin-hacks_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/how-to-change-your-name-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003172.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3172 23228 bytes
SHA-256: 43632a79ab52b587d5c08a5decca46bd74bc9dffaf3ab7b9a0fb5e9101141ff7
font_01_sfnt_off000065e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65E4 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
font_02_sfnt_off00006fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FC9 18080 bytes
SHA-256: e08d712d3c7717e534c8527a13ecdf608e6cf7fb005f990d3f063776d4a09a25

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