Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ef1539af5f9f00…

MALICIOUS

PDF

35.4 KB Created: 2021-07-03 12:53:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 539f5714471cd5351a9fbb529688c03f SHA-1: ceb7e187759eb24e67696b55820be86ea98df218 SHA-256: a5ef1539af5f9f00414872b5c23591a92cdbd3884a3c67dcf8bd4f89da668bad
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a malicious lure, using the "Robux Hack Tools" theme to entice users. It contains a high density of external links, many pointing to other PDF files, suggesting a link farm or a method to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs and a call-to-action phrase reinforces the suspicious nature of the document.

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.tw/app/431946152/robux-hack-tools-game-hack
    • https://e-learning.manbangkalan.sch.id/__statics/gudangsoal/files/roblox-broken-bones-cheat_GM431946152.pdf
    • https://e-learning.manbangkalan.sch.id/__statics/gudangsoal/files/roblox-cape-free_GM431946152.pdf
    • https://e-learning.manbangkalan.sch.id/__statics/gudangsoal/files/pokemon-go-free-games-online_GM1094591345.pdf
    • https://e-learning.manbangkalan.sch.id/__statics/gudangsoal/files/how-to-make-free-clothing-to-people-on-roblox_GM431946152.pdf
    • https://e-learning.manbangkalan.sch.id/__statics/gudangsoal/files/how-to-be-naked-on-roblox-free_GM431946152.pdf
    • https://e-learning.manbangkalan.sch.id/__statics/gudangsoal/files/where-to-get-free-robux_GM431946152.pdf
    • https://e-learning.manbangkalan.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-and-obc-2021_GM431946152.pdf
    • https://e-learning.manbangkalan.sch.id/__statics/gudangsoal/files/tiktok-free-textbooks_GM835599320.pdf
    • https://e-learning.manbangkalan.sch.id/__statics/gudangsoal/files/get-free-codes-roblox_GM431946152.pdf
    • https://e-learning.manbangkalan.sch.id/__statics/gudangsoal/files/nev-roblox-hack-exploit_GM431946152.pdf
    • https://e-learning.manbangkalan.sch.id/__statics/gudangsoal/files/faces-on-roblox-for-free_GM431946152.pdf
    • https://e-learning.manbangkalan.sch.id/__statics/gudangsoal/files/roblox-full-spiderman-outfit-free_GM431946152.pdf
    • https://e-learning.manbangkalan.sch.id/__statics/gudangsoal/files/kuso-icu-roblox-hack_GM431946152.pdf
    • https://e-learning.manbangkalan.sch.id/__statics/gudangsoal/files/coin-master-free-spins-and-coins_GM406889139.pdf
    • https://e-learning.manbangkalan.sch.id/__statics/gudangsoal/files/free-roblox-accounts-with-builders-club-2021_GM431946152.pdf
    • https://e-learning.manbangkalan.sch.id/__statics/gudangsoal/files/how-50-robux-gift-card-free_GM431946152.pdf
    • https://e-learning.manbangkalan.sch.id/__statics/gudangsoal/files/minecraft-java-edition-download-free_GM479516143.pdf
    • https://e-learning.manbangkalan.sch.id/__statics/gudangsoal/files/free-spins-coin-master-unlimited_GM406889139.pdf
    • https://e-learning.manbangkalan.sch.id/__statics/gudangsoal/files/hack-coin-master-32-mod-apk_GM406889139.pdf
    • https://e-learning.manbangkalan.sch.id/__statics/gudangsoal/files/robloxheroxyz-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000032e0.bin
2a0ec3c3c3af987849ff2950da1ca552508688b179dd87ff87353e86de869629		 pdf-font-stream PDF embedded font (sfnt) at offset 0x32E0 22888 bytes
font_01_sfnt_off000065f3.bin
97734c8ebbf9bdc7b81322975eb62755299ace721750a42e967de7f23eec8635		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65F3 18796 bytes

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