Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9de4ae85f5138ea…

MALICIOUS

PDF

41.0 KB Created: 2020-09-12 01:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04d5a7ab68fc476b35630900fab18f89 SHA-1: f81360715518d8d56e508b0b621798de30f1970d SHA-256: d9de4ae85f5138ea9fd4e5a2dca5e7b2809c3f6f3a3459ae92b5d951799432c6
150 Risk Score

Malware Insights

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

The PDF document contains a prominent link to 'ttraff.me', which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to a 'free petty cash log sheet' and the malicious URL, suggesting a social engineering lure. The presence of a link farm further indicates malicious intent to distribute further malicious content.

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.me/wix?keyword=free+petty+cash+log+sheet
    • http://files.ifapa-africa.com/uploads/1/3/1/4/131407767/9559722.pdf
    • http://files.wilmiepaguntalan.com/uploads/1/3/2/6/132695258/fefitetomubajo.pdf
    • https://cdn.shopify.com/s/files/1/0439/4457/5131/files/7th_grade_math_benchmark_test.pdf
    • https://cdn.shopify.com/s/files/1/0437/6212/2903/files/befokekavo.pdf
    • https://cdn.shopify.com/s/files/1/0438/3745/6534/files/79941127535.pdf
    • https://static.usrfiles.com/ugd/0582e0_52a18e6d981d40d295df0d62a0f1eb06.pdf
    • https://static.usrfiles.com/ugd/824332_537abe936a1a4779be9bede5d3a36d93.pdf
    • https://static.usrfiles.com/ugd/ae059d_45ab5a2daba04477988818d7b5998e83.pdf
    • https://static.usrfiles.com/ugd/1813b3_465f179eea0141cc9be3386b73d11e69.pdf
    • https://static.usrfiles.com/ugd/76de1a_fea8fbb3b9714102ac19c41199e0d22e.pdf
    • https://cdn.shopify.com/s/files/1/0429/0917/1879/files/lejulasutilugusu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5720/9753/files/fagibozonorowujabejoverok.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_off00006457.bin
570a6bf456eea56e44e3cfe8f6d3cdc12fbb8fd69b16cce76cbc2668d8dd6fcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6457 5252 bytes
font_01_sfnt_off0000763b.bin
fc7350a62b0f4d2c1a7df32c539541232211c0ef89d247d070404644605eb892		 pdf-font-stream PDF embedded font (sfnt) at offset 0x763B 9848 bytes

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