Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40c3fc6ef374085…

MALICIOUS

PDF

44.1 KB Created: 2020-08-11 16:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f1099205159665f6d96962bcc233022 SHA-1: 8f554aa91de259415b2cbd53f1c9ed4c112c553c SHA-256: f40c3fc6ef374085f7eccbb5dd7bedf4eba9ac63c68dc3f90ceb7e418f5cef3e
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.ru). This suggests a link farm used for SEO poisoning or to host malicious content. The document body, though heavily obfuscated, contains the malicious URL, indicating an attempt to trick users into downloading a file or visiting a malicious site under the guise of a technical handbook.

Heuristics 3

  • 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.
  • 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.ru/pify?keyword=ashrae+fundamentals+handbook+pdf+download
    • http://files.chartercommittee.org/uploads/1/3/1/0/131070113/3620550.pdf
    • http://files.jazzwealth.com/uploads/1/3/0/7/130776037/8635392.pdf
    • http://files.barnontheweb.com/uploads/1/3/2/3/132303209/c6c900fbf902c31.pdf
    • http://files.threestorycoffee.com/uploads/1/3/2/6/132681812/dovumizasixexaguj.pdf
    • https://cdn.shopify.com/s/files/1/0438/0911/2226/files/xewilufituravel.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2623/files/introduction_to_binary_number_system.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/21659337375.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2949/files/sagan_bonjour_tristesse.pdf
    • https://cdn.shopify.com/s/files/1/0431/1403/7397/files/wozotivoxu.pdf
    • https://cdn.shopify.com/s/files/1/0429/0707/4723/files/61934591704.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/welilavuruwad.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gamawogedeveredu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8172/files/48709960068.pdf
    • https://cdn.shopify.com/s/files/1/0433/3273/1038/files/fovunoxevuwabo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0464/8859/files/73563272541.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_off000068a5.bin
8760b2ccd3d3df52c34b18c32aef0f89900527091680efc8113510602ae07903		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68A5 5568 bytes
font_01_sfnt_off00007b64.bin
efad124303701e512643b154ac50f581da23503e78235feb1992cb8b4573f8c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B64 13240 bytes

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