Malicious PDF — malware analysis report

Static analysis result for SHA-256 4634b37fafa95849…

MALICIOUS

PDF

44.2 KB Created: 2021-06-03 21:21:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 540275a5b378150173f66a7da2829d4e SHA-1: 3174d688bc269919ea738fff13e524fd0df093da SHA-256: 4634b37fafa9584942b227ad8165cdbfe0a79ea68a196bf91ace15ce3d277797
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external websites, many of which are disguised as PDF files related to popular games and hacks. The primary goal appears to be SEO manipulation and directing users to potentially malicious sites, such as the one offering a 'free generator / game hack'. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a lure to download further malicious content or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.online/app/431946152/rbx-com-game-hack PDF link annotation
    • https://kojak-group.com/userfiles/files/pokemon-go-free-ultra-box_GM1094591345.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-spin-coin-master-new-link_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-spons-apk-2021_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-spin-2912-2021_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/minecraft-items_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-robux-accounts_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/pokemon-go-free-7km-eggs-august-2021_GM1094591345.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/minecraft-logo-maker-free_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/get-robux-now_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-get-free-faces-on-roblox_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/arsenal-hacks-roblox_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/best-free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-coins-coin-master-link-today_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-get-free-robux-easy-2021_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_004_off00004fb4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FB4 25468 bytes
SHA-256: 9bd0033ddd35798d905fb50978cc29b8065bf209d61c65928c35a3297c2c08ea
font_01_sfnt_off00008b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B05 17972 bytes
SHA-256: dffe5730268319e8d6523eb3a7b4d2737e6b1bc7523d2c18f722e59dff9dcb58

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