Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a138a509ce4c23b…

MALICIOUS

PDF

43.6 KB Created: 2021-05-11 23:34:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 33cb822019e9c56811c0c25a6d32421b SHA-1: 97ee48615bd5d909634f41edf24b90a3f98e17f2 SHA-256: 4a138a509ce4c23b381e8a03f71fff08d43699ba86bee80626d3c62b6f995d76
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for game hacks and redirects to known malicious infrastructure. The embedded URL points to a "free generator / game hack" page, which is a common social engineering tactic to trick users into downloading malware or visiting malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.xyz/app/406889139/how-to-get-free-spins-on-coin-master-iphone-game-hack In PDF document text
    • http://nationshield.ae/userfiles/files/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/roblox-ftw_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/roblox-hack-app_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/watch-ads-for-robux_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/minecraft-download-free-download_GM479516143.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/robuxfree-con_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/minecraft-pvp-hacks_GM479516143.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/hack-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/roblox-cp_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/is-minecraft-free_GM479516143.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/hack-coin-master-online-without-human-verification_GM406889139.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/coin-master-free-codes_GM406889139.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/free-robux-group-payouts_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_003_off00004dd2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DD2 25484 bytes
SHA-256: b9b5a4b8f6b1ef952d8e2f7598016fc52322fe9000fbd79c440b52a25594e1cf
font_01_sfnt_off00008879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8879 18216 bytes
SHA-256: 4abc04ae18af900904d959d44b4d7f5fba5ec4f6f1bcd15d05ed7773e8e469d6

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