Malicious PDF — malware analysis report

Static analysis result for SHA-256 c29679e9c5ce3643…

MALICIOUS

PDF

44.6 KB Created: 2021-06-10 23:56:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6502ca8b7e4756366944ccb31f404ccb SHA-1: d8ea53505c53f1063cfb3f66213ebf1fa8a137f7 SHA-256: c29679e9c5ce36431e76aefd254a5bebbe1c7a11848b51b0db0fc40127d0297d
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are SEO-optimized to appear as legitimate resources for free Robux or game hacks. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/r-free-robux-game-hack PDF link annotation
    • http://elibrary.smknesbu.sch.id/repository/fun-and-free-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/buxblast-com-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/500-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-make-clothes-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-do-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-list_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/minecraft-java-edition-free-code_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-no-download_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-picture_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-coins-spins_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/hack-coin-master-for-free_GM406889139.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
stream_004_off0000500c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x500C 26008 bytes
SHA-256: a6132adfcd082e40718f54dca528aa8166c2d83625d87cdbece7aa059aa6a5b0
font_01_sfnt_off00008c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C77 18012 bytes
SHA-256: 86b85fc3b415537f6991d46a0ea6159ff986c790b6ad5767e6fe355a03f35e43

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