Malicious PDF — malware analysis report

Static analysis result for SHA-256 009982aaa27a37df…

MALICIOUS

PDF

44.9 KB Created: 2021-06-07 12:44:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 55063e01cb7fc9c60ee91a5253288551 SHA-1: cbcf2a7060a495c44c548271553fafe3c3a6d6c8 SHA-256: 009982aaa27a37dfdae7776b26df1232f80ed53f848123f8b65bae3d3fbaf925
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a document body that attempts to lure users with promises of free game currency and items. The presence of a 'Password-protected archive handoff' heuristic suggests the document may be intended to trick users into downloading an encrypted payload. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/free-robux-fun-game-hack PDF link annotation
    • https://vosco.vn/uploads/vosco.vn/files/how-to-get-minecraft-dungeons-for-free_GM479516143.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/how-to-get-free-minecraft-coins_GM479516143.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/robux-converter_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/free-coins-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/minecraft-windows-10-hacked-client_GM479516143.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/hack-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/how-to-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/free-daily-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/coin-master-free-daily-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/free-robux-mod_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/coin-master-cheats_GM406889139.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/robux-com-free_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/blogger-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://vosco.vn/uploads/vosco.vn/files/coin-master-hack-tool-access-online-generator_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_off00005069.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5069 25976 bytes
SHA-256: 622259ec2a1b2890291318d6a5b0e0f15c278fada497a38d9caf5f240323f4f7
font_01_sfnt_off00008dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DDE 18012 bytes
SHA-256: 083fd8091f78c7d83a31c5ae356a3e219d5d877673c3fcc698a384c8f589e56b

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