Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf547ed548bd840…

MALICIOUS

PDF

45.7 KB Created: 2021-05-13 15:06:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4e78d3b38500fe090d0ce50ffc83c3d0 SHA-1: 8941b8119d8672a0ae0957a9ea8f31c019e23e12 SHA-256: fdf547ed548bd8406a802ff3cca9a4a7b969031815624366ac8741261ce73841
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 0.9507

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/479516143/windows-10-minecraft-hacks-game-hack PDF link annotation
    • http://bw.ac.th/userfiles/files/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/coin-master-free-spins-and-coins-for-today_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-robux-pins_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/bux-gg-robux-free_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-spins-on-coin-master-2021-ios_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/rbx-roblox-robux_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-robux-please_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/coin-master-free-spins-today-new_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/coin-and-spin_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/coin-master-card-link-free_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-spins-coin-master-2021-app_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-multiplayer-minecraft-server_GM479516143.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/free-coin-master-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/best-site-for-free-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://bw.ac.th/userfiles/files/how-to-get-free-hair-on-roblox-2021_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_003_off000049f7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49F7 25948 bytes
SHA-256: e1e917d52bd56ad92fb8568b1ea011d99bbc758f3a4512fcc9a4a5d56b8a0cb3
font_01_sfnt_off000084d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84D7 2892 bytes
SHA-256: c2578a292634a901613c1dd9f9883dd4930e6811e59ae03d696f263e56ea17b4
font_02_sfnt_off00008ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EC1 18696 bytes
SHA-256: 404a6a828e36ead2d4cd56abe684579086ad140455fa529c5546af7349081cf7

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