Malicious PDF — malware analysis report

Static analysis result for SHA-256 9de854a751cac3b9…

MALICIOUS

PDF

58.8 KB Created: 2020-08-30 06:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38e40e8544b5efdf4120f14c60e8684a SHA-1: e1423dc487db8e636fce3a4e3e67ffe1e8ef6919 SHA-256: 9de854a751cac3b93c8ea7a762f94c38534b8819114e55fe2094e5a5450c336f
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains a malicious redirector link pointing to ttraff.com, which is a known malicious domain. The document body, though heavily obfuscated, contains text related to a 'paint.net manual' and a URL that appears to be a lure for downloading a PDF. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm used for SEO poisoning or to obscure the final malicious destination.

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://ttraff.com/wix?keyword=paint.net+manual+espa%25C3%25B1ol
    • https://cdn.shopify.com/s/files/1/0437/8863/2213/files/upkar_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/2002/4989/files/xowowodizorijagerezufot.pdf
    • https://cdn.shopify.com/s/files/1/0429/3863/0300/files/18657926478.pdf
    • https://cdn.shopify.com/s/files/1/0437/6294/2106/files/91096107473.pdf
    • https://cdn.shopify.com/s/files/1/0432/6424/5922/files/dumilim.pdf
    • https://cdn.shopify.com/s/files/1/0427/9051/8940/files/carboprost_davis_drug_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/3789128943.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/60457854104.pdf
    • https://cdn.shopify.com/s/files/1/0437/2869/9553/files/casarse_pronto_y_mal_larra.pdf
    • https://static.usrfiles.com/ugd/c345b0_9f749b798da7472f8eeccd32a8783b41.pdf
    • https://static.usrfiles.com/ugd/b8c837_757eb45f7b604307b38eaf564db98e1c.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a640.bin
9bdb26aa506b699a9e5a423e863f7779234dd8c2f8bea43876074fbf68b457db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA640 5112 bytes
font_01_sfnt_off0000b751.bin
12b4ddd0dcb5750bfbe48a175dcfb19de4444d82d58aa0f4244d1b21427f63ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB751 11096 bytes

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