Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f13a9ed9d3617f2…

MALICIOUS

PDF

43.6 KB Created: 2021-05-12 07:00:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b707bae6c254ef04dda2c67675c96378 SHA-1: 46785e893526c64734fe33983daf8904fbdb5aa2 SHA-256: 3f13a9ed9d3617f241db216cd515d8f8a57dddd952d2b4b9ab2774a2ce7b0697
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free generators' and 'game hacks'. The primary lure URL is https://netcdn.xyz/app/431946152/oprewards-com-robux-game-hack, which is likely intended to lead users to a phishing or malware download site. 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/431946152/oprewards-com-robux-game-hack In PDF document text
    • https://arcasict.nl/images/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • https://arcasict.nl/images/minecraft-win-10-free_GM479516143.pdfIn PDF document text
    • https://arcasict.nl/images/coin-master-free-spins-instagram_GM406889139.pdfIn PDF document text
    • https://arcasict.nl/images/minecraft-bedrock-edition-pc-free_GM479516143.pdfIn PDF document text
    • https://arcasict.nl/images/minecraft-windows-10-edition-hacked-client_GM479516143.pdfIn PDF document text
    • https://arcasict.nl/images/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • https://arcasict.nl/images/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • https://arcasict.nl/images/robux-app_GM431946152.pdfIn PDF document text
    • https://arcasict.nl/images/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://arcasict.nl/images/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://arcasict.nl/images/get-coin-master-spins-free_GM406889139.pdfIn PDF document text
    • https://arcasict.nl/images/coin-master-hack-game-download-ios_GM406889139.pdfIn PDF document text
    • https://arcasict.nl/images/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • https://arcasict.nl/images/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://arcasict.nl/images/coin-master-hacks-iphone_GM406889139.pdfIn PDF document text
    • https://arcasict.nl/images/coin-master-free-attack_GM406889139.pdfIn PDF document text
    • https://arcasict.nl/images/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://arcasict.nl/images/static-moonactive-net-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://arcasict.nl/images/robux_GM431946152.pdfIn PDF document text
    • https://arcasict.nl/images/coin-master-free-spins-for-today_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_off00004887.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4887 27400 bytes
SHA-256: 08e2fb54fa847561f74b47a6fd829464464cb1aebe74aa7757c1efc40c85d8f4
font_01_sfnt_off0000861f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x861F 18852 bytes
SHA-256: cf2c3b83afe77c4831f4d7babd4a60d9ba9b4343e1e798506478eab5d5eea77b

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