Malicious PDF — malware analysis report

Static analysis result for SHA-256 08ff6d08a5e1ed80…

MALICIOUS

PDF

43.8 KB Created: 2021-06-09 07:03:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 654c5dae693d068edb1fdd28e7634a0e SHA-1: 77865f81ce528f0bc03523f06c95ea5983822821 SHA-256: 08ff6d08a5e1ed803766a166d8ac2f0993c0181787b82a512db4dce7ff1560bc
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are SEO-optimized PDF links pointing to sites offering free in-game items and currency. The document body, though heavily obfuscated, contains references to 'free items' and 'Roblox', aligning with the link farm's theme. The presence of numerous external links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.tw/app/431946152/when-will-more-free-items-come-to-roblox-game-hack PDF link annotation
    • https://www.manmed.info:443/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/coin-master-free-spins-2021-hack_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/master-free-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://www.manmed.info:443/images/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-games-like-minecraft_GM479516143.pdfIn PDF document text
    • https://www.manmed.info:443/images/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/tiktok-free-unblocked_GM835599320.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-boy-hair-roblox-catalog_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-pokemon-go-accounts-level-35_GM1094591345.pdfIn PDF document text
    • https://www.manmed.info:443/images/getrobux-come_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/roblox-a_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/coin-master-free-coins-facebook_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_004_off00004e48.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E48 24556 bytes
SHA-256: 77d44f40d6db701aa5ad5bb2383a549a4fc84be4e08a66c5b3d8674de8f43702
font_01_sfnt_off000086b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86B3 18992 bytes
SHA-256: de0e0aa9f3df0d6e0ebbaf89a83e837a66ac3e954cde6fe83ea3b2e325c1fef5

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