Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c75cd91d4497c79…

MALICIOUS

PDF

32.8 KB Created: 2021-06-25 00:32:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: d85597b885c3ede0f3dcbd312a907587 SHA-1: 66a8f8cc504f092da52641e5afeed9fe1ae126f2 SHA-256: 9c75cd91d4497c790fe60e56f3af513e3189d159dd62118036e8dd79ef6b4f68
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users into downloading game hacks and generators. These links redirect to known malicious infrastructure, indicating a phishing or scam attempt. The document body explicitly mentions 'Roblox Hack Tool 2021 Download' and 'CLICK HERE TO ACCESS ROBUX GENERATOR', reinforcing the deceptive nature of the content. While no scripts were directly extracted, the PDF structure and embedded URLs strongly suggest a malicious redirection workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 http://netcdn.co/app/431946152/roblox-hack-tool-2021-download-game-hack In PDF document text
    • https://invertsports.com/images/pubg-10-000-uc-free_GM1330123889.pdfIn PDF document text
    • https://invertsports.com/images/free-tiktok-followers-without-verification_GM835599320.pdfIn PDF document text
    • https://invertsports.com/images/minecraft-windows-10-edition-free-download_GM479516143.pdfIn PDF document text
    • https://invertsports.com/images/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://invertsports.com/images/hack-para-assassin-roblox_GM431946152.pdfIn PDF document text
    • https://invertsports.com/images/how-do-i-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://invertsports.com/images/cheats-for-terminator-gensys-for-roblox_GM431946152.pdfIn PDF document text
    • https://invertsports.com/images/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://invertsports.com/images/free-codes-for-roblox-high-school_GM431946152.pdfIn PDF document text
    • https://invertsports.com/images/roblox-free-gold-chain_GM431946152.pdfIn PDF document text
    • https://invertsports.com/images/free-roblox-printables_GM431946152.pdfIn PDF document text
    • https://invertsports.com/images/how-to-get-free-skins-in-minecraft_GM479516143.pdfIn PDF document text
    • https://invertsports.com/images/how-to-hack-billionaire-simulator-roblox_GM431946152.pdfIn PDF document text
    • https://invertsports.com/images/robux-hack-download-2021_GM431946152.pdfIn PDF document text
    • https://invertsports.com/images/gamingtutorial-co-free-robux_GM431946152.pdfIn PDF document text
    • https://invertsports.com/images/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • https://invertsports.com/images/como-conseguir-fuerza-en-boxing-simulator-2-roblox-cheat_GM431946152.pdfIn PDF document text
    • https://invertsports.com/images/free-roblox-hack_GM431946152.pdfIn PDF document text
    • https://invertsports.com/images/how-to-get-infinite-robux_GM431946152.pdfIn PDF document text
    • https://invertsports.com/images/how-to-hack-roblox-models_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_off000029c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29C3 21592 bytes
SHA-256: feca35de42b5c9756b9a633231e39c51ec00e218bb2769e651ab33626d257f2e
font_01_sfnt_off00005963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5963 19564 bytes
SHA-256: 3ec176b0f4be237b57d2abf6796b399fb15fb87d85f7ae0b5750f18f1d313134

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