Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c881e2320c2d93c…

MALICIOUS

PDF

41.9 KB Created: 2020-08-29 16:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7fdcd13b4aba1597feb2673bd44bfe6 SHA-1: 286ab9ad6cc99b3686a6fa9d05cddca66d319bf6 SHA-256: 3c881e2320c2d93c27dcc2f51c21dd42c5c0c01d3a8934f3e1c62140c96422be
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The heuristic firings indicate this is a link farm designed to distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the primary attack vector appears to be the redirection to malicious URLs.

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=panasonic+er224+rc+parts
    • https://static.usrfiles.com/ugd/b8c837_f2e93d614ef0489c8784e8870139b88a.pdf
    • https://static.usrfiles.com/ugd/b8c837_acfffb4ccc3644329500c1ea517f5368.pdf
    • https://static.usrfiles.com/ugd/b8c837_e835c8c5d900456da26b5ef66bba75af.pdf
    • https://static.usrfiles.com/ugd/b8c837_ee56a1f1e6994cc096b493eadf3f2424.pdf
    • https://cdn.shopify.com/s/files/1/0427/8029/5334/files/tuvejewupatab.pdf
    • https://static.usrfiles.com/ugd/b8c837_d34944ebd7a840a1aca28e821e20bf63.pdf
    • https://static.usrfiles.com/ugd/8de238_2b76d9ad39914b10b47fbb4db8e3a807.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a4506a47f6047d0a94f367898079fad.pdf
    • https://static.usrfiles.com/ugd/0f5b72_6962c42796a74205a62c39797304679f.pdf
    • https://cdn.shopify.com/s/files/1/0434/4319/1960/files/ninimapoganigoxokebaxes.pdf
    • https://cdn.shopify.com/s/files/1/0450/9948/3301/files/c_stl_iterator_implementation.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_off00006649.bin
5236b334771d8453d3e58580afeb02aeaf3d1ae47bfac1990ca6a5d6f79218d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6649 5116 bytes
font_01_sfnt_off000077bd.bin
7ca4aef78635c174f32e64588f2b1f97bb2cec3950be1adf198e3261108520a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77BD 10460 bytes

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