Malicious PDF — malware analysis report

Static analysis result for SHA-256 c98457c7e1258576…

MALICIOUS

PDF

35.5 KB Created: 2021-07-06 13:25:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 938ead9a3cdef34a77bd37e75fa950d4 SHA-1: 74620c1ef775ea22989d75ff4e790a4a3702e705 SHA-256: c98457c7e1258576ee807a5b102bd8f2a0208c229cde9bbe71398dc2ac0fc765
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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/coin-master-free-attack-hack-game-hack PDF link annotation
    • https://perpus.upp.ac.id/digilib/repository/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/minecraft-free-trial_GM479516143.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-rare-cards-for-coin-master-christmas_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/minecraft-java-hacks_GM479516143.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/play-minecraft-online-free_GM479516143.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-roblox-names_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/robux-prices_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/roblox-sexually_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/ways-to-earn-robux_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/roblox-hack-robux-2021-zn-francais_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-blogspot_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-hack-root_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/games-to-play-free-no-membership-on-roblox_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/best-free-roblox-executor_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_off00003444.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3444 23192 bytes
SHA-256: 7e9312dfe8534bb7cd023440ed7d3163161d1edb8d2bbdd10f02c24a7ea94761
font_01_sfnt_off00006874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6874 18168 bytes
SHA-256: 77f95f04567bf1dae2980aee4eb06266131c8f3c94fbaa988a5df0c5268c5636

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