Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff8306f9f45684a6…

MALICIOUS

PDF

41.5 KB Created: 2020-08-29 17:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f417335beb7aaf6b2e6aa60fe8c4fd4 SHA-1: ef3e56c397c046cdfe0905de3fcd59c52e43546e SHA-256: ff8306f9f45684a6efe4ea1ae1d88fe142b1ed2f6a89b33c94742eb285eacde0
150 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is 'https://ttraff.ru/wix?keyword=ablebits+excel+free', which is linked to a known malicious redirector. The document body, though heavily obfuscated, also contains this URL and other links pointing to a large number of PDFs hosted on Shopify, suggesting a link farm designed to lure users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.ru/wix?keyword=ablebits+excel+free
    • https://cdn.shopify.com/s/files/1/0432/5202/3458/files/rolakuvilulixeroxakox.pdf
    • https://cdn.shopify.com/s/files/1/0437/4528/0161/files/estado_financiero_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0428/2348/3548/files/buwurakeba.pdf
    • https://cdn.shopify.com/s/files/1/0431/5247/4267/files/bcs_mcq_answer_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/7713/1683/files/brain_stem_death_criteria.pdf
    • https://static.usrfiles.com/ugd/e32576_8b33ed72b045405c9eedf1825bfd9568.pdf
    • https://cdn.shopify.com/s/files/1/0436/3524/5214/files/vebadizuvaxuvixifir.pdf
    • https://cdn.shopify.com/s/files/1/0436/0034/7299/files/pukabuwe.pdf
    • https://cdn.shopify.com/s/files/1/0434/5665/9617/files/choral_music_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/2704/6298/files/simplifying_algebraic_fractions_worksheet_kuta.pdf
    • https://cdn.shopify.com/s/files/1/0450/0425/9492/files/27075778063.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_off00006526.bin
17c29dd900eb0b9103fb46e565b094344c77ac5974b1104475c2bc4dffaf8e1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6526 4860 bytes
font_01_sfnt_off000075bd.bin
865385e7720f45aedf5d82af096a67e252fd2f7a3953fbbf00eb2c113311f85a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75BD 10592 bytes

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