Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb42d38552d5ca73…

MALICIOUS

PDF

49.2 KB Created: 2020-07-24 06:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7b5ad477c7c4cab3ffbd594b9443857 SHA-1: 18b93485569667f0c4dce0eb74822bfea737902c SHA-256: fb42d38552d5ca73181289224333b8c5b9d8e90da50607667c6b4925a6d722a0
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 indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'Air cadet uniform guide'. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or phishing pages.

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=air+cadet+uniform+guide
    • http://files.autismeducatorsact.org/uploads/1/3/1/4/131454034/7450090.pdf
    • http://files.teamcraigracing.com/uploads/1/3/2/6/132681951/divofa.pdf
    • http://files.whereisseb.com/uploads/1/3/1/3/131380889/7a83830fa3e.pdf
    • http://files.ssgroupelectric.com/uploads/1/3/0/7/130776536/danubulagaka.pdf
    • http://files.equinoxsupplements.co.uk/uploads/1/3/2/8/132814611/faxewunoralaj_rimapujalema_ganarawezutetuk_vowidimot.pdf
    • https://cdn.shopify.com/s/files/1/0434/2130/2935/files/jijutuniririlujef.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vawis.pdf
    • https://cdn.shopify.com/s/files/1/0430/4207/8877/files/17545881539.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0077/files/16688731639.pdf
    • https://cdn.shopify.com/s/files/1/0430/5901/9933/files/repejodedijedejus.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11783771814.pdf
    • https://cdn.shopify.com/s/files/1/0428/2348/3548/files/9066849563.pdf
    • https://cdn.shopify.com/s/files/1/0435/0833/4744/files/74074324465.pdf
    • https://cdn.shopify.com/s/files/1/0432/1404/5341/files/76190595917.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30106301206.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8714/files/detoxezimifibawo.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/
    • https://cdn.shopify.com/s/files/1/0

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007788.bin
971af2922ebb1fa41df59a8aaa72b029cfaa5cd3111273f4aff3525f839cff4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7788 5004 bytes
font_01_sfnt_off00008865.bin
9253e9fa64c6921229602c5a55efa2ec2d8470593021342c9b4374a4ec041e74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8865 15256 bytes

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