Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2036ad23e02e89…

MALICIOUS

PDF

46.3 KB Created: 2020-08-31 00:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de33e91cc8d6022afdba71dcd0508e9f SHA-1: eaa14151f19ed35d6bab98fa1f0c70944ed3d883 SHA-256: 4f2036ad23e02e893829b305ed91f8c5427ed861ac96fe0488b1c64ca5f886cf
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as a summary of Aristotle's rhetoric. The PDF also contains a large number of links to other PDFs hosted on shopify.com, likely as part of a link farm to improve SEO for malicious content. The ML classifier strongly indicated maliciousness.

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.cc/wix?keyword=aristotle+rhetoric+summary
    • https://cdn.shopify.com/s/files/1/0432/8862/5302/files/cause_and_effect_essay_outline.pdf
    • https://cdn.shopify.com/s/files/1/0437/1025/1176/files/canada_census_short_form_questions.pdf
    • https://cdn.shopify.com/s/files/1/0437/5812/5207/files/76911161633.pdf
    • https://cdn.shopify.com/s/files/1/0434/5289/1298/files/daxenuza.pdf
    • https://cdn.shopify.com/s/files/1/0431/5106/5243/files/81543234186.pdf
    • https://cdn.shopify.com/s/files/1/0430/1357/0709/files/tijasapadojem.pdf
    • https://cdn.shopify.com/s/files/1/0432/7469/8902/files/866658195.pdf
    • https://static.usrfiles.com/ugd/2b3f46_0210c3984b9141578228f0eb8bd8c07a.pdf
    • https://static.usrfiles.com/ugd/1c90dc_dc44de3a44574d8497bddfeeb057a50c.pdf
    • https://static.usrfiles.com/ugd/b8c837_779b68eb25c74137b70b912d9a4bf8a8.pdf
    • https://static.usrfiles.com/ugd/432b07_d43fdcdf12244ee0867bc44db7493e72.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_off00007691.bin
ff96e04f8272725ee51f81a4d259262466c8aa06bbb1abc4416a0e692f278c4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7691 5132 bytes
font_01_sfnt_off000087df.bin
779e14504c6c50fc0f6849f8985cd0e7cb171d465c9db98e5d91091a30d516a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87DF 10932 bytes

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