Malicious PDF — malware analysis report

Static analysis result for SHA-256 74d8f32f052a3571…

MALICIOUS

PDF

45.4 KB Created: 2021-06-03 11:48:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: bb77f0187fd412d362cec425e53e6cd0 SHA-1: 9399d50cc22b1690e60af816d45c08f3a8fbea2d SHA-256: 74d8f32f052a3571fec38169a0646024ab2f49309f62d0ac7e14fedb6447e3cd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains links designed to lure users into clicking on a malicious redirector, which is associated with game hacks and free currency generators. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple embedded URLs pointing to similar lures reinforces this assessment. The primary malicious URL identified is https://netcdn.online/app/406889139/coin-master-daily-gift-free-spins-and-coins-game-hack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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-daily-gift-free-spins-and-coins-game-hack In PDF document text
    • https://library.stikeswnpalu.ac.id/repository/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/robux-offers_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/free-spin-app-coin-master_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/village-3-coin-master_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/robux-hack-tools_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/pubg-uc-free-app_GM1330123889.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/coin-master-download_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/no-human-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/will-minecraft-dungeons-be-free_GM479516143.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/free-coin-master-gift-link_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/static-moonactive-net-free-spins_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/make-your-own-minecraft-server-free_GM479516143.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/robux-gainer_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/how-to-be-a-wannabe-hacker-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/free-robux-2021-no-human-verification_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_off0000555d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x555D 24772 bytes
SHA-256: 0531107c4aae8a454549f4293a3efd4b333fe4e3900b6f63282e95131d67f9a9
font_01_sfnt_off00008e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E64 18480 bytes
SHA-256: 3ccd0e6e182247473c8fd8a661e1697f212027199d1cdaa086bf60c9e83bc44d

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