Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa71ada4e82235b4…

MALICIOUS

PDF

48.0 KB Created: 2021-06-09 17:10:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9efb580dc3ee0a6d01441ffa383d2285 SHA-1: ed88d6a71241f577ccf9f168bb0d449a68aa1f3d SHA-256: aa71ada4e82235b496fc54a94ab0a7d753f1e70735d327596f9e66f27ef32f0b
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 0.9796

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/free-account-roblox-passebin-game-hack PDF link annotation
    • http://perpus.i2s-learning.com//repository/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-roblox-thumbnail_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-robux-generator_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-tiradas-gratis-link_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-adopt-me-free-game_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-spins-coin-master-april-2021_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-coin-master-coins-2021_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/get-robux-today_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-things-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-wall-hack-jailbreak_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-apk-hacked-3526_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-free-spins-link-no-verification-code_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_004_off0000541a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x541A 25244 bytes
SHA-256: f7d5d4b56dc03a28bd1f52fba3e767f8561ad6a3c998e5873000faa0c94ddb28
font_01_sfnt_off00008e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E42 2836 bytes
SHA-256: fd98c8f6e7c2e74bbd5822409159a93ac5c94da083ae4c2eb269d4284375f9e8
font_02_sfnt_off000097e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97E8 18696 bytes
SHA-256: 9fd6c28f64d991703dc9eb7f97ca40d462b985f5770ff0bbde3b7abc5f7bcd54

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