Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2351f952bdc9540…

MALICIOUS

PDF

44.6 KB Created: 2021-05-12 03:34:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 2a2876741745f3a67327fcdba7577c4d SHA-1: 7ce816161d4ae78c2134b444510771ab50d4d07f SHA-256: c2351f952bdc9540bf8a34bdbec2b6c4973c22b899b1b7768033ee5e3b89e634
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document employs a lure related to "free Robux" and "game hacks" to trick users into interacting with malicious links. The document displays a fake CAPTCHA or human verification prompt, designed to coerce users into clicking the embedded malicious URL. The primary malicious URL identified is https://netcdn.xyz/app/431946152/how-to-get-free-robux-2021-no-human-verification-game-hack, which is linked to known malicious redirector infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.xyz/app/431946152/how-to-get-free-robux-2021-no-human-verification-game-hack In PDF document text
    • http://library.darmaagung.ac.id//repository/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/fake-robux-codes_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/cute-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/coin-master-sound-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/hack-coin-master-android-game_GM406889139.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/how-to-cheat-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/watch-videos-for-robux_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/give-me-robux-now_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/minecraft-aimbot_GM479516143.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/minecraft-java-account-free_GM479516143.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/play-games-for-robux_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/how-to-hack-coin-master-without-root_GM406889139.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/coin-master-collect-today-free-spin_GM406889139.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/flame-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://library.darmaagung.ac.id/repository/coin-master-hack-iosgods_GM406889139.pdfIn PDF document text
    • http://library.darmaagung.ac.id//repository/regal-world-coin-master_GM406889139.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_003_off00004d71.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D71 26304 bytes
SHA-256: 1e4f8993d54ddde8e675c575276b084fbdb5adbdbbd6418eb75ddcece6ff7f89
font_01_sfnt_off000088a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88A5 19428 bytes
SHA-256: dfc7ca414cfca4f80301273998e01ceb4bfd22e3de883fcbe9d6a0102e8d41a4

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