Malicious PDF — malware analysis report

Static analysis result for SHA-256 971c1d902c2ea144…

MALICIOUS

PDF

43.7 KB Created: 2021-05-15 11:48:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 368f4f6adbae6ea90a159feb1718758a SHA-1: f974ed1dfb8bf9b446fe61f7af12dcbd85049645 SHA-256: 971c1d902c2ea1440f01a3e8e0c24638ea74d073355c1e63953f01e53a858699
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector domains, specifically promoting 'free Robux' and game hacks. These links are likely designed to lead users to malicious websites or download further malware. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded links suggest a social engineering lure to facilitate initial compromise.

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/431946152/games-that-give-free-robux-game-hack In PDF document text
    • http://nosocomium.rv.ua/images/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://nosocomium.rv.ua/images/free-draw-roblox_GM431946152.pdfIn PDF document text
    • http://nosocomium.rv.ua/images/free-coin-app_GM406889139.pdfIn PDF document text
    • http://nosocomium.rv.ua/images/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://nosocomium.rv.ua/images/coin-master-hack-android-no-root_GM406889139.pdfIn PDF document text
    • http://nosocomium.rv.ua/images/reddit-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://nosocomium.rv.ua/images/coin-master-free-gold-cards-link-2021ee-spins_GM406889139.pdfIn PDF document text
    • http://nosocomium.rv.ua/images/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://nosocomium.rv.ua/images/free-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://nosocomium.rv.ua/images/how-to-make-a-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • http://nosocomium.rv.ua/images/oprewards-login_GM431946152.pdfIn PDF document text
    • http://nosocomium.rv.ua/images/earn-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://nosocomium.rv.ua/images/ro-ghoul-script_GM431946152.pdfIn PDF document text
    • http://nosocomium.rv.ua/images/113-hacked-client_GM479516143.pdfIn PDF document text
    • http://nosocomium.rv.ua/images/free-roblox-toy-codes_GM431946152.pdfIn PDF document text
    • http://nosocomium.rv.ua/images/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://nosocomium.rv.ua/images/coin-master-free-generator_GM406889139.pdfIn PDF document text
    • http://nosocomium.rv.ua/images/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://nosocomium.rv.ua/images/oprewards-com-roblox_GM431946152.pdfIn PDF document text
    • http://nosocomium.rv.ua/images/coin-master-free-gifts_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_off000047bc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47BC 27812 bytes
SHA-256: f79290e850932cc63d67c7fc2bdd5501d40ada09ce80718f92900c2192d75775
font_01_sfnt_off00008679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8679 19004 bytes
SHA-256: 2c8b49b77d2c215152c292f7884bc67c80baba545cc8313e1cf14c5f8a523509

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