Malicious PDF — malware analysis report

Static analysis result for SHA-256 812c3bb3025498cf…

MALICIOUS

PDF

35.2 KB Created: 2021-07-03 20:52:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: dd5d7a39171aaeac805cb25595547151 SHA-1: decd88d9e0d4549cb7701f9bad37885ad4d46a20 SHA-256: 812c3bb3025498cff6fd0b58d9fd4506b48078bf2043659ee26c2c190afddc72
102 Risk Score

Malware Insights

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

The PDF document contains numerous links, identified as a 'PDF_SEO_LINK_FARM' heuristic, that point to websites promising free Robux or game hacks. The document body explicitly mentions 'How To Get Free Robux On Mobile' and includes URLs such as 'http://netcdn.tw/app/431946152/how-to-get-free-robux-on-mobile-game-hack'. This indicates a likely phishing or scam attempt designed to redirect users to malicious sites.

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/how-to-get-free-robux-on-mobile-game-hack PDF link annotation
    • http://elearning.mtsnkra.sch.id/__statics/gudangsoal/files/dexen-hack-roblox_GM431946152.pdfIn PDF document text
    • http://elearning.mtsnkra.sch.id/__statics/gudangsoal/files/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://elearning.mtsnkra.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-accounts-2021-may_GM431946152.pdfIn PDF document text
    • http://elearning.mtsnkra.sch.id/__statics/gudangsoal/files/robux-2021-free_GM431946152.pdfIn PDF document text
    • http://elearning.mtsnkra.sch.id/__statics/gudangsoal/files/how-to-upload-audio-for-free-roblox_GM431946152.pdfIn PDF document text
    • http://elearning.mtsnkra.sch.id/__statics/gudangsoal/files/roblox-cheat-second-till-death_GM431946152.pdfIn PDF document text
    • http://elearning.mtsnkra.sch.id/__statics/gudangsoal/files/free-roblox-backdoor-to-earn-robux_GM431946152.pdfIn PDF document text
    • http://elearning.mtsnkra.sch.id/__statics/gudangsoal/files/secret-forums-released-free-robux-duplicator-100-working_GM431946152.pdfIn PDF document text
    • http://elearning.mtsnkra.sch.id/__statics/gudangsoal/files/coin-master-hackcom-xyz_GM406889139.pdfIn PDF document text
    • http://elearning.mtsnkra.sch.id/__statics/gudangsoal/files/free-robux-stream_GM431946152.pdfIn PDF document text
    • http://elearning.mtsnkra.sch.id/__statics/gudangsoal/files/youtube-roblox-get-free-money-on-rocitizens-august_GM431946152.pdfIn PDF document text
    • http://elearning.mtsnkra.sch.id/__statics/gudangsoal/files/free-printable-roblox-images_GM431946152.pdfIn PDF document text
    • http://elearning.mtsnkra.sch.id/__statics/gudangsoal/files/roblox-bloxburg-free-pastebin_GM431946152.pdfIn PDF document text
    • http://elearning.mtsnkra.sch.id/__statics/gudangsoal/files/how-do-doload-hacks-in-roblox_GM431946152.pdfIn PDF document text
    • http://elearning.mtsnkra.sch.id/__statics/gudangsoal/files/can-lucky-patcher-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://elearning.mtsnkra.sch.id/__statics/gudangsoal/files/free-coins_GM406889139.pdfIn PDF document text
    • http://elearning.mtsnkra.sch.id/__statics/gudangsoal/files/free-robux-para-roblox_GM431946152.pdfIn PDF document text
    • http://elearning.mtsnkra.sch.id/__statics/gudangsoal/files/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://elearning.mtsnkra.sch.id/__statics/gudangsoal/files/where-can-i-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://elearning.mtsnkra.sch.id/__statics/gudangsoal/files/free-bear-face-mask-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_off00003280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3280 22140 bytes
SHA-256: cade9506e7f44952e66e354cede5fe9b0570875230985bd9f5cd822eb7003358
font_01_sfnt_off00006396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6396 19372 bytes
SHA-256: 5331e3b47e1eecd1b1cb57ee2f3545b8b8fbb1b10f6e158321778d87dfa25569

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