Malicious PDF — malware analysis report

Static analysis result for SHA-256 8310ef7bc3643cf8…

MALICIOUS

PDF

34.9 KB Created: 2021-07-01 18:13:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b31d2fd89816bd55af7031aaa48b7a35 SHA-1: f8a30129ea4e9b168cb46e5c58b994db077e48a6 SHA-256: 8310ef7bc3643cf8805063517ad81a4b9947224a03d42517069a53d340aa6620
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains numerous embedded URLs and a document body that mimics a download lure for game-related cheats and currency. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to attract users searching for such content. The ML classifier also strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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.co/app/431946152/free-redeem-codes-for-roblox-builders-club-generator-game-hack
    • https://pn-tapaktuan.go.id/pustaka/repository/how-to-hack-to-get-free-robux-2021_GM431946152.pdf
    • https://pn-tapaktuan.go.id/pustaka/repository/roblox-lua-script-hacks_GM431946152.pdf
    • https://pn-tapaktuan.go.id/pustaka/repository/free-roblox-hack_GM431946152.pdf
    • https://pn-tapaktuan.go.id/pustaka/repository/roblox-speed-hack-jailbreak_GM431946152.pdf
    • https://pn-tapaktuan.go.id/pustaka/repository/coin-master-unlimited-spin-link_GM406889139.pdf
    • https://pn-tapaktuan.go.id/pustaka/repository/free-spins-on-coin-master-links-2021_GM406889139.pdf
    • https://pn-tapaktuan.go.id/pustaka/repository/coin-master-cheats-free-spins_GM406889139.pdf
    • https://pn-tapaktuan.go.id/pustaka/repository/free-robux-without-any-verification_GM431946152.pdf
    • https://pn-tapaktuan.go.id/pustaka/repository/minecraft-apk-free-download_GM479516143.pdf
    • https://pn-tapaktuan.go.id/pustaka/repository/bloxburg-free-roblox_GM431946152.pdf
    • https://pn-tapaktuan.go.id/pustaka/repository/coin-master-free-spins-link-today-hack_GM406889139.pdf
    • https://pn-tapaktuan.go.id/pustaka/repository/how-to-hack-minecraft-pe_GM479516143.pdf
    • https://pn-tapaktuan.go.id/pustaka/repository/roblox-pc-download-free_GM431946152.pdf
    • https://pn-tapaktuan.go.id/pustaka/repository/free-robux-for-no-money_GM431946152.pdf
    • https://pn-tapaktuan.go.id/pustaka/repository/free-robux-mobile-no-verification_GM431946152.pdf
    • https://pn-tapaktuan.go.id/pustaka/repository/free-robux-no-human-verification-or-survey-ipad_GM431946152.pdf
    • https://pn-tapaktuan.go.id/pustaka/repository/free-robux-hack-100-works-trackid-sp006_GM431946152.pdf
    • https://pn-tapaktuan.go.id/pustaka/repository/how-to-hack-in-roblox-prison-life_GM431946152.pdf
    • https://pn-tapaktuan.go.id/pustaka/repository/how-to-hack-a-roblox-account-august-2021_GM431946152.pdf
    • https://pn-tapaktuan.go.id/pustaka/repository/200-free-spins-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000302d.bin
2eb0754a868074c6d6caafc306e0dcac72cca7a482b48ab3fd7d20b65998628e
pdf-font-stream PDF embedded font (sfnt) at offset 0x302D 22420 bytes
font_01_sfnt_off0000625f.bin
be12ff8e7343bc22c2dc884b035c2121db5fe1ff355e88f4b5587eb0ac2382b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x625F 19448 bytes