Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9748320384a645…

MALICIOUS

PDF

42.6 KB Created: 2021-05-17 15:00:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8ef9993043cb67541c52b3ef18659b0d SHA-1: 8f26a8178e49135abc15030f545b1dee03426611 SHA-256: 9b9748320384a645cfbde0c1ce8623237f820ceca36e690be658661fd7af382d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector domains and websites promising free game-related items, such as Robux and Coin Master spins. The heuristic firings indicate these links lead to malicious redirectors and are part of a lure for game hacks. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to drive users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/sites-to-get-free-robux-game-hack In PDF document text
    • http://cornerwebstudio.com/images/free-robux-co_GM431946152.pdfIn PDF document text
    • http://cornerwebstudio.com/images/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://cornerwebstudio.com/images/como-conseguir-monedas-infinitas-y-tiradas-de-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://cornerwebstudio.com/images/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://cornerwebstudio.com/images/minecraft-free-play-now_GM479516143.pdfIn PDF document text
    • http://cornerwebstudio.com/images/free-minecraft-printables_GM479516143.pdfIn PDF document text
    • http://cornerwebstudio.com/images/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://cornerwebstudio.com/images/100-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://cornerwebstudio.com/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://cornerwebstudio.com/images/coin-master-how-to-get-japan-sushi-card-free_GM406889139.pdfIn PDF document text
    • http://cornerwebstudio.com/images/coin-master-game-hack-apk_GM406889139.pdfIn PDF document text
    • http://cornerwebstudio.com/images/free-roblox-com_GM431946152.pdfIn PDF document text
    • http://cornerwebstudio.com/images/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://cornerwebstudio.com/images/coin-master-invite-friends-free-spins_GM406889139.pdfIn PDF document text
    • http://cornerwebstudio.com/images/free-bedrock-minecraft_GM479516143.pdfIn PDF document text
    • http://cornerwebstudio.com/images/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://cornerwebstudio.com/images/blogger-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://cornerwebstudio.com/images/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://cornerwebstudio.com/images/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://cornerwebstudio.com/images/get-free-robux_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
font_00_sfnt_off00004978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4978 25848 bytes
SHA-256: 178b357ade08c9e9c7795a27d76082b424d742515bd2f1ba18404ab06edd3b58
font_01_sfnt_off00008426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8426 18236 bytes
SHA-256: b3c6e6b81f0aade665b3e9e34fb665158f9d1803db8458128eb468a961d6d74b

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