Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f65affadf760cb…

MALICIOUS

PDF

47.8 KB Created: 2021-06-09 04:55:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7814d33ef24a56691e2dd1331fe6aea0 SHA-1: ab0a66223f5406c89094d2d6944d72355dac579f SHA-256: b1f65affadf760cb92d4af6d4fb27cbd4630a70e69a6c955323567d3feae5f2f
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 0.9769

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 https://netcdn.tw/app/431946152/deep-ocean-roblox-hack-game-hack PDF link annotation
    • https://perpustakaan.stami.ac.id/repository/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/roblox-old-avatar_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/best-site-for-free-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-spin-and-coin-blogspot_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/how-to-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/links-to-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/como-sacar-buen-puntaje-en-juego-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/mcpe-master-coins-hack-download_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-free-gift-links-2021_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/how-to-get-free-hair-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-coin-link-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/20210-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004fdb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FDB 25300 bytes
SHA-256: c0af15f47461978b61b425ff6dd778da9d383ce27ad4ca229849566a059846ad
font_01_sfnt_off00008aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AA6 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off0000974e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x974E 18528 bytes
SHA-256: 53ca0e61c63036e688bc639e57683f6ce0d947168ee138c4883530d618098aff

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