Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5dbe8afe7424b8a…

MALICIOUS

PDF

33.7 KB Created: 2021-06-25 14:35:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3f8a6cdf08b68c0b136ee6c9174c3db5 SHA-1: 0b88802085851c797a0d08238c78dd7ade90304f SHA-256: a5dbe8afe7424b8a4cbb087919954ab14f8c1047fd8812331cdc6ac314e904c6
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded URLs that are designed to lure users into downloading potentially malicious files by promising free in-game items or currency. The ML classifier and the PDF_SEO_LINK_FARM heuristic strongly indicate malicious intent, likely to exploit users seeking free virtual goods. The document's content and structure suggest it is part of a phishing or scam campaign.

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/how-to-get-free-items-from-games-roblox-2021-game-hack PDF link annotation
    • http://repository.ummy.ac.id//repository/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/roblox-re_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/how-to-get-free-admin-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-free-spin-links-december-30-2021_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/free-robux-gift-card-codes-december-2021_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/2021-free-robux-202120210-working-legggggit_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/hacks-master-coin_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/kuso-icu-roblox-hack_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/is-minecraft-free-on-computer_GM479516143.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/como-tener-dinero-infinito-roblox-high-school-hack_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/robux-for-free-2021-no-vertification_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id/repository/roblox-ninja-legends-mobile-hack_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/daily-spin-coin-master-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
font_00_sfnt_off00002eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EB9 21192 bytes
SHA-256: 655dabef89ad3891cd8b7031cbb6d03fc93994c68f181b55cb9e51bc4d3688f9
font_01_sfnt_off00005cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CDB 19580 bytes
SHA-256: 092d464dcae1b2a0dc82d1857fa443a7995a0a577ab1bc262e0702fd47fc027b

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