Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8f47789caa6b8b…

MALICIOUS

PDF

47.6 KB Created: 2021-05-18 02:33:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1b1273e3b23e6eb96a7fa3df7ec4e8ff SHA-1: ab64764ee357113c944508151a92b65f5b2a4261 SHA-256: 3a8f47789caa6b8be2ee6248c3eae31bde45bbdcc8960f6999856f85e5f8e479
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 0.9013

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.xyz/app/406889139/coin-master-free-spins-daily-link-updated-game-hack PDF link annotation
    • https://gaushalango.com/uploaded_files/userfiles/files/hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • https://gaushalango.com/uploaded_files/userfiles/files/coin-master-free-spins-gratis_GM406889139.pdfIn PDF document text
    • https://gaushalango.com/uploaded_files/userfiles/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://gaushalango.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://gaushalango.com/uploaded_files/userfiles/files/free-roblox-clothes-and-hair_GM431946152.pdfIn PDF document text
    • https://gaushalango.com/uploaded_files/userfiles/files/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • https://gaushalango.com/uploaded_files/userfiles/files/free-roblox-printables_GM431946152.pdfIn PDF document text
    • https://gaushalango.com/uploaded_files/userfiles/files/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://gaushalango.com/uploaded_files/userfiles/files/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://gaushalango.com/uploaded_files/userfiles/files/robux-win_GM431946152.pdfIn PDF document text
    • https://gaushalango.com/uploaded_files/userfiles/files/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • https://gaushalango.com/uploaded_files/userfiles/files/hack-coin-master-apk-33_GM406889139.pdfIn PDF document text
    • https://gaushalango.com/uploaded_files/userfiles/files/robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://gaushalango.com/uploaded_files/userfiles/files/free-robux-please_GM431946152.pdfIn PDF document text
    • https://gaushalango.com/uploaded_files/userfiles/files/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • https://gaushalango.com/uploaded_files/userfiles/files/kachifpro_GM406889139.pdfIn PDF document text
    • https://gaushalango.com/uploaded_files/userfiles/files/hack-coin-master-no-verification_GM406889139.pdfIn PDF document text
    • https://gaushalango.com/uploaded_files/userfiles/files/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • https://gaushalango.com/uploaded_files/userfiles/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • https://gaushalango.com/uploaded_files/userfiles/files/coin-master-hack-2021_GM406889139.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_003_off00004a7e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A7E 29868 bytes
SHA-256: aff24b0e87b311e44fa3c181ad047e8c5f72fcf8e56b8ca2edc025b6fda863b6
font_01_sfnt_off00008c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C32 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off000095e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95E4 18836 bytes
SHA-256: 483be81730c5d51d00079e0b96a35004c6f4ace92d0df16fea0b4a10a7a49318

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