Malicious PDF — malware analysis report

Static analysis result for SHA-256 835ba7f3d59c591f…

MALICIOUS

PDF

52.1 KB Created: 2021-06-04 00:43:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a49cc4da3633542dbdd8d320635eeee2 SHA-1: aadadb34518589cd977eeea142b002862747f2c6 SHA-256: 835ba7f3d59c591fee712de52f2b41a8bfd9d24e1d4e1747375937a75ff692de
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 0.9657

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.online/app/406889139/coin-master-hack-spins-and-coins-unlimited-free-game-hack PDF link annotation
    • http://library.umla.ac.id/repository/coin-master-hack-apk-download-latest-version_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/easy-robux-com_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-troll-outfits-free_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/what-tiktok-free-folowers-without-downloading-any-apps_GM835599320.pdfIn PDF document text
    • http://library.umla.ac.id/repository/pokemon-go-free-weekly-remote-raid-pass_GM1094591345.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-get-free-pet-snacks-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/can-i-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/hack-master-coin_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-hack-root_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coinmaster-spin-ml_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-tix-generator_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-viking-quest-hack_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005516.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5516 25836 bytes
SHA-256: 57f7adf18846849bea62557aee562bebe459a22a70a8b19a80219f3faab16526
font_01_sfnt_off00008fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FE9 4028 bytes
SHA-256: 6a4891da4f8b73c02e22ecd6fa566d6bb4f5f2d5575b30a343f3d3c5e0919267
font_02_sfnt_off00009d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D8C 2788 bytes
SHA-256: 6fd7c7f447d66842f81aa8cf197935b17f22157d0c7e9f95622df1b5b4ddf530
font_03_sfnt_off0000a77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA77C 18752 bytes
SHA-256: 9894c068b10d635aa02e8d25afb59d141e90fd875449b50e52c6a3fbfc43112a

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