Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9ed01a2427ec473…

MALICIOUS

PDF

45.9 KB Created: 2021-05-20 00:09:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 07f1b3cee5727b608b6da18b2c8a0fdf SHA-1: d6b3cbd21c0c0a377e03199a1f7134a32107bd6d SHA-256: d9ed01a2427ec473e4750960aacb5d38dbe8376e9970e232af2fcefed8730a65
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious SEO or content distribution scheme. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links indicate an attempt to redirect users to potentially harmful content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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.xyz/app/406889139/free-spins-coin-master-november-2021-game-hack PDF link annotation
    • http://arkivthy.dk/images/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/how-to-get-free-roblox-hair_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://arkivthy.dk/images/blox-best-robux_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/free-spins-for-coin-masters_GM406889139.pdfIn PDF document text
    • http://arkivthy.dk/images/coin-master-spin-link-today_GM406889139.pdfIn PDF document text
    • http://arkivthy.dk/images/how-to-get-a-refund-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/how-can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://arkivthy.dk/images/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/coin-master-villages_GM406889139.pdfIn PDF document text
    • http://arkivthy.dk/images/pokemon-go-free-zoom_GM1094591345.pdfIn PDF document text
    • http://arkivthy.dk/images/cute-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/how-to-download-wurst_GM479516143.pdfIn PDF document text
    • http://arkivthy.dk/images/add-robux_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/minecraft-free-install_GM479516143.pdfIn PDF document text
    • http://arkivthy.dk/images/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/coin-master-free-shield-link_GM406889139.pdfIn PDF document text
    • http://arkivthy.dk/images/minecraft-pocket-edition-download-free-pe-calculator_GM479516143.pdfIn PDF document text
    • http://arkivthy.dk/images/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://arkivthy.dk/images/free-card-link-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004813.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4813 30492 bytes
SHA-256: f862e89558d3b6f25befe0942037cc4d5a11e5d9791694849293ef986eec1655
font_01_sfnt_off00008556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8556 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F40 18820 bytes
SHA-256: 51030d0b126b89f1cc2c8ab05e6528d79dc2725cd6845144c535f360e3c6c899

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