Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2907c856fd94d53…

MALICIOUS

PDF

47.0 KB Created: 2021-05-12 15:06:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 734c678500899b43d3cbb91dba56636f SHA-1: 4bc30d03f6cfd79d0ab9abf9bdc1f3053516b071 SHA-256: a2907c856fd94d538a208e527dc4fbc9bccc82848a55a274115d9a158cb8fbb2
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that form a link farm, directing users to sites offering "hacks" for games like Robux and Coin Master. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these deceptive links, suggesting a malicious workflow designed to trick users into downloading further malware or engaging in scams. The presence of a "download button" lure reinforces this deceptive intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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 https://netcdn.xyz/app/431946152/robux-hack-free-robux-game-hack PDF link annotation
    • https://library.sdksantamariabwi.sch.id/repository/coin-master-free-spins-today-39_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/how-to-get-free-food-for-foxy-in-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/minecraft-for-free-apk_GM479516143.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/coin-master-hack-app-2021_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/free-spins-for-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/coin-master-hack-tool-india_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/hack-my-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/coin-master-ios-hack_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/free-spins-coin-master-april-2021_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/hack-coin-master-343-apk_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/free-spin-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/coin-master--hack_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/robux-com-roblox_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_003_off00004b5d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B5D 26576 bytes
SHA-256: 8542b143c23bb8da9a77a6fcef0975f8a74a2f12d712659d5f19596112ee6818
font_01_sfnt_off000087ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87ED 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off000094ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94FF 18412 bytes
SHA-256: e7ad190f023b5a59f82d5d2304e728b1fb84096fbbeb22520bbc212286f43b51

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