Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed38dfa7431d75b9…

MALICIOUS

PDF

42.3 KB Created: 2020-09-03 01:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a808e8e4c628ea2ed8134f44c0fcc37d SHA-1: 4f81cbc6337bb9c7986a8ff72045ff02443246b0 SHA-256: ed38dfa7431d75b968c5058e6a3aeaff3272d2e6259dd3c22bcc4ea90e943fb7
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.club/wix?keyword=knee+osteoarthritis+exercise+pdf', is designed to lead users to malicious infrastructure. The document also contains a large number of external PDF links, characteristic of a link farm, with the primary one being 'https://cdn.shopify.com/s/files/1/0433/6818/6015/files/lurivonokujimorezu.pdf'. The ML classifier 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.club/wix?keyword=knee+osteoarthritis+exercise+pdf
    • https://cdn.shopify.com/s/files/1/0433/6818/6015/files/lurivonokujimorezu.pdf
    • https://cdn.shopify.com/s/files/1/0437/4292/0869/files/5779020896.pdf
    • https://cdn.shopify.com/s/files/1/0457/0031/7340/files/comparative_balance_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0430/9316/4199/files/90058752716.pdf
    • https://static.usrfiles.com/ugd/b8c837_901166200ca84c9492832501ae1e2cc4.pdf
    • https://static.usrfiles.com/ugd/764aaa_632a38f7ef1b4733ad6f8caf653da8c8.pdf
    • https://static.usrfiles.com/ugd/0d2fda_9e349768e9584e89a2493b072903797f.pdf
    • https://static.usrfiles.com/ugd/b28561_7e31d6f914f74ec6a2d4cecb65a5e994.pdf
    • https://cdn.shopify.com/s/files/1/0431/2131/1910/files/action_movies_hollywood_hd.pdf
    • https://cdn.shopify.com/s/files/1/0440/8098/8325/files/zazuzikabobefomaxeruzi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3932/6365/files/poluredakasajezowokosa.pdf
    • https://cdn.shopify.com/s/files/1/0434/2729/9478/files/82471978902.pdf
    • https://cdn.shopify.com/s/files/1/0430/6213/2897/files/wedulamemimudanakigafas.pdf
    • https://cdn.shopify.com/s/files/1/0432/3901/4562/files/xomunaxaridukefezazuwo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5906/9599/files/nuzezog.pdf
    • https://cdn.shopify.com/s/files/1/0431/0505/8976/files/76925048875.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_off0000673c.bin
0f6630639b938304c78f90cc2a127361e35afb6da469ffffbfb70d1c2ce9b6c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x673C 5248 bytes
font_01_sfnt_off0000791d.bin
289b3f574693bee1d45e78c1e83696fbd00abc636cce865e7713fe5a6948c60e
pdf-font-stream PDF embedded font (sfnt) at offset 0x791D 10340 bytes