Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddcb9f8f2270f6d8…

MALICIOUS

PDF

42.4 KB Created: 2021-05-17 12:36:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6193db97b5bcbff157d339dcc88ccc46 SHA-1: cb1094dffef2b8018fa79df4eb06d3b878d65d59 SHA-256: ddcb9f8f2270f6d8fde0258f1fbc4a64c88275e60ab18bf076155d1e19b78945
142 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, identified as a link farm, pointing to external PDF files. The ML classifier and the PDF_SEO_LINK_FARM heuristic strongly indicate malicious intent, likely for SEO spam or to distribute further malicious content. The presence of a 'ClickFix' heuristic suggests the document may also attempt to trick users into executing commands.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.xyz/app/479516143/minecraft-fly-hack-game-hack
    • http://ddsadler.net/images/coin-master-daily-free-spins-link-haktuts_GM406889139.pdf
    • http://ddsadler.net/images/coin-master-free-spins-link-download-free_GM406889139.pdf
    • http://ddsadler.net/images/free-vip-server-roblox_GM431946152.pdf
    • http://ddsadler.net/images/roblox-fun-com-free-robux_GM431946152.pdf
    • http://ddsadler.net/images/how-to-make-roblox-clothes-for-free_GM431946152.pdf
    • http://ddsadler.net/images/coin-master-latest-version-hack_GM406889139.pdf
    • http://ddsadler.net/images/roblox-earn-robux_GM431946152.pdf
    • http://ddsadler.net/images/free-robux-script_GM431946152.pdf
    • http://ddsadler.net/images/coin-master-daily-spin-link_GM406889139.pdf
    • http://ddsadler.net/images/free-roblox_GM431946152.pdf
    • http://ddsadler.net/images/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdf
    • http://ddsadler.net/images/how-to-get-free-robux-2021_GM431946152.pdf
    • http://ddsadler.net/images/get-robux-today_GM431946152.pdf
    • http://ddsadler.net/images/20210-free-spin-links-for-coin-master_GM406889139.pdf
    • http://ddsadler.net/images/mcpe-master-hack-unlimited-coins_GM406889139.pdf
    • http://ddsadler.net/images/hack-xp-net-coin-master_GM406889139.pdf
    • http://ddsadler.net/images/free-spin-links-coin-master-2021_GM406889139.pdf
    • http://ddsadler.net/images/coin-master-free-daily-spins-link_GM406889139.pdf
    • http://ddsadler.net/images/free-coin-and-spin-link_GM406889139.pdf
    • http://ddsadler.net/images/how-to-get-free-robux-promo-codes_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c32.bin
f435c85c0cad621096a1d20bf0fda344d2e9f9ef7d3b9381b3cb58929837e0d5
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C32 24732 bytes
font_01_sfnt_off00008477.bin
06651707645ad1f4ebda8b3f746ca430a0b9618d46277a77061ba05985c34688
pdf-font-stream PDF embedded font (sfnt) at offset 0x8477 17992 bytes