Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd6629da3af204b2…

MALICIOUS

PDF

41.6 KB Created: 2020-08-10 23:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02d8d7925b4d68a01c73cd9c3310643f SHA-1: ff1dbb62df6438cf1e758695f8a2c9d53284ce4f SHA-256: dd6629da3af204b26f848214c54e25b1c2d9183006e1d8274b00d76bb91b5cd4
150 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The embedded URL points to 'ttraff.com', which is known for redirecting to malicious sites. The document body, though heavily obfuscated, contains text related to 'free printable calligraphy practice sheets pdf' and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of numerous external PDF links further supports the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.com/pify?keyword=free+printable+calligraphy+practice+sheets+pdf
    • http://files.webblox.com/uploads/1/3/2/7/132712483/ligafapojewiluzume.pdf
    • http://files.summerswebdesigns.com/uploads/1/3/1/0/131070434/tuwogemilagabufumilu.pdf
    • http://files.htmflagsprogram.org/uploads/1/3/2/8/132814972/mumitas_musejepeda_tetimepivol.pdf
    • https://cdn.shopify.com/s/files/1/0429/6101/0842/files/timubunuvumitivop.pdf
    • https://cdn.shopify.com/s/files/1/0427/7354/5116/files/28343963723.pdf
    • https://cdn.shopify.com/s/files/1/0429/9961/1553/files/rorabogadel.pdf
    • https://cdn.shopify.com/s/files/1/0428/4933/7507/files/session_id_is_token.pdf
    • https://cdn.shopify.com/s/files/1/0434/7330/5762/files/63487048981.pdf
    • https://cdn.shopify.com/s/files/1/0429/3863/0300/files/gary_gygax_world_builder.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/melezenosirulobilido.pdf
    • https://cdn.shopify.com/s/files/1/0430/5682/4471/files/how_to_delete_folder_in_github.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pujipipokumamidepuw.pdf
    • https://cdn.shopify.com/s/files/1/0432/1627/3576/files/website_development_proposal_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/2836/4968/files/jademavifuzavebuniku.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_off000064fe.bin
f7a092e79c32225df24b993f0771c99402da2d9086670e65cd420d9e9c49b24d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64FE 5616 bytes
font_01_sfnt_off00007808.bin
62efb5469837adea00e9512c7f1d5facca1bfa0436ce8e51214fce4f30e5e7f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7808 9732 bytes

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