Malicious PDF — malware analysis report

Static analysis result for SHA-256 eae9742e3fa243a1…

MALICIOUS

PDF

35.3 KB Created: 2021-07-04 02:07:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5da99ae69f97745b20b88bbaeb822587 SHA-1: d2deba7256836f5546c965a30c2e83595acc1b36 SHA-256: eae9742e3fa243a16df5521f07589617cad1f908c763ae07c71c88c825b535cf
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on library.umla.ac.id and appear to be part of a link farm designed to attract users searching for game hacks and cheats. The primary URL, http://netcdn.tw/app/406889139/free-games-coin-master-game-hack, suggests a lure for a Coin Master game hack. The ML classifier strongly indicated maliciousness, and the presence of a link farm is a common tactic for distributing malware or phishing content.

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/406889139/free-games-coin-master-game-hack PDF link annotation
    • http://library.umla.ac.id/repository/veste-free-in-game-roblox_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/roblox-got-talent-piano-hack_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/earn-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/how-to-win-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-hack-roblox-the-with-downloading-apps_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/pokemon-go-free-evolve-with-trade_GM1094591345.pdfIn PDF document text
    • http://library.umla.ac.id//repository/114-4-hacks_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-get-doge-head-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-coins-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-get-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/lazyblocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-roblox-items-codes_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/got-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-daily-spins_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/earn-free-robux-online-no-survey_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
stream_002_off00003293.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3293 23376 bytes
SHA-256: 327d61fe6abdb5b9bb95764bc25ebbd6d9a8b94a4104942b6b817d53a1784802
font_01_sfnt_off0000676e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x676E 18260 bytes
SHA-256: fd4693102e0c70bd9b134649e89dea9b96e321b78383e447acf31454b633f9d3

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