Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d99f3cbef94d574…

MALICIOUS

PDF

46.2 KB Created: 2021-06-03 06:22:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 0d92b6b659623f00a06034b15eb60bb2 SHA-1: 2d072df842a10e88812caf7b092ce68725d0daa6 SHA-256: 7d99f3cbef94d57486d5f652b7a40316fe7dff8e6ab007dadb515d10c394872d
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 0.9832

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/431946152/free-t-shirt-roblox-game-hack PDF link annotation
    • http://www.elibrary.perludem.org/repository/regal-world-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/roblox-rewards-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-hack-version-download-ios_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/robuxfree-con_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/pubg-uc-20210_GM1330123889.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-co_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/freerobux-hack-us_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/robux-hack-tools_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-re_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-hack-coin-master-apple_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/robux-codes_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005449.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5449 26608 bytes
SHA-256: 5f390b8af05353f49efdf69e4f583b58bc473983da2baea27a2c384473670f9f
font_01_sfnt_off00009247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9247 18340 bytes
SHA-256: 2d05e254e9d88d662aa6e20ca1badb4d8e3c9bd921fc5d0ad34db7ef5b503ac5

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