Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a65b4d78149589…

MALICIOUS

PDF

44.0 KB Created: 2020-08-31 04:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbff4ffbfac5654ed7fa5b0b8298e099 SHA-1: dd87dbfea8e8b435e7b3ee59cd12aeaed95f5108 SHA-256: 37a65b4d781495892706ddfb843730b0d599af6da76328d280e4bf1b805d330f
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised with a book title. The PDF also exhibits characteristics of a link farm, with numerous embedded links to other PDFs, many hosted on Shopify. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/wix?keyword=trials+of+apollo+the+dark+prophecy
    • https://cdn.shopify.com/s/files/1/0432/6513/0660/files/running_man_174.pdf
    • https://cdn.shopify.com/s/files/1/0431/1895/2612/files/sample_regression_test_plan_template.pdf
    • https://cdn.shopify.com/s/files/1/0444/1961/2839/files/83155009820.pdf
    • https://static.usrfiles.com/ugd/0c41e7_9b6f72d855504c2293be340d5d304bab.pdf
    • https://static.usrfiles.com/ugd/cbe7f7_ba52642f4cb540129c6a5a36995ce4cc.pdf
    • https://static.usrfiles.com/ugd/afe78f_74f400f192b1467e96964d588f668323.pdf
    • https://static.usrfiles.com/ugd/b8c837_c4ad8f2148d84b52aa9d9178b43073df.pdf
    • https://static.usrfiles.com/ugd/b8c837_cea07075accc4661a987b733a964a772.pdf
    • https://static.usrfiles.com/ugd/06497e_8913edf6b7eb4a82bef2b00ad440a619.pdf
    • https://static.usrfiles.com/ugd/f80014_6e4834bd006f4d4ca24e62c1ff44f9fc.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_off00006e9a.bin
f6dac53437fdef65f8ce1821bfd3aa7eab37fb1033e104abceb68622f2a6ab57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E9A 5356 bytes
font_01_sfnt_off000080d3.bin
cd5bfba39295fb1443d1837b3965891ce9a57cbd6857e777a3d0dbb01a36cff1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80D3 10156 bytes

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