Malicious PDF — malware analysis report

Static analysis result for SHA-256 77545d3c355ce0e8…

MALICIOUS

PDF

34.1 KB Created: 2021-06-26 08:58:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: fc5a0015e50cbed5ea51e3726712d300 SHA-1: fa1f399cb79238d4bd93eb4bc82fd014b218a294 SHA-256: 77545d3c355ce0e820862e6d714f1eef82dd3bbc67466f49066d28e660873429
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded links, identified as a PDF link farm, that point to external resources. These links are designed to appear as legitimate download pages for game hacks and cheats, such as 'robuxy-com-free-robux-game-hack'. The presence of a ML classifier flagging the PDF as malicious and the 'SE_DOWNLOAD_BUTTON' heuristic further support the malicious intent of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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
  • 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 http://netcdn.co/app/431946152/robuxy-com-free-robux-game-hack PDF link annotation
    • https://resmed.ear.com.tw/image/data/files/free-roblox-carf_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/roblox-infinite-jump-hack-with-pictures_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-printable-roblox-coloring-pages_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/coin-master-pc-hack-download_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/roblox-robux-generator-hack-softonic_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/legit-coin-master-hack-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/march-18-roblox-hack_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-roblox-injector-for-hacks-2021_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/roblox-eye-poppers-free-hack_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-robux-copy-and-paste_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-coins-for-roblox_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-coin-master-links_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
font_00_sfnt_off00002f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F1F 21980 bytes
SHA-256: e9d3c899b91dfe61f02fabf3755f66c2f2fda64e66f1c69cbd5844b22fd491a2
font_01_sfnt_off00005fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE9 19156 bytes
SHA-256: b91dd01bf7aa8d90f2367b3a0684131ce65c63b3af9073ea9819d735ead4d135

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