PDF malware analysis — malicious · e64bbd1feafc6245

MALICIOUS

PDF

40.7 KB Created: 2020-08-29 04:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 1a68d6cac25ee308215036bdf58c91d3 SHA-1: ea9ec53c725c617c2f9345f6e187d8fff2161883 SHA-256: e64bbd1feafc6245e6e790d9e197949949493704bdfcdc069a7330ceb7979f41

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass external link farm, with many links pointing to PDFs hosted on static.usrfiles.com. One of these links, https://ttraff.cc/wix?keyword=download+fear+the+walking+dead+seaso, is identified as a known malicious redirector. The document body also contains this URL, suggesting it's the primary lure. The ML classifier strongly flagged this PDF as malicious.

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=download+fear+the+walking+dead+seaso
- https://static.usrfiles.com/ugd/b8c837_92636154c2234b04bc6406555cb7d128.pdf
- https://static.usrfiles.com/ugd/b8c837_79d09ca406784685849305817ff7fbf2.pdf
- https://static.usrfiles.com/ugd/b8c837_aba1fba1bc5040efb1d4dfdd006c0330.pdf
- https://static.usrfiles.com/ugd/b8c837_377c94258a5f403998d57114d9890b01.pdf
- https://static.usrfiles.com/ugd/b8c837_96ad637ede0f401fb2f0e59d16a6e310.pdf
- https://cdn.shopify.com/s/files/1/0435/0319/0181/files/pegatikiroxaviwesikusuvob.pdf
- https://cdn.shopify.com/s/files/1/0435/0751/5558/files/superficial_thrombophlebitis_nice_guidelines.pdf
- https://cdn.shopify.com/s/files/1/0431/5624/2589/files/android_studio_tutorial_2020_free_download.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/63912397784.pdf
- https://static.usrfiles.com/ugd/b8c837_dd30a3165401484da617c59abe85d728.pdf
- https://static.usrfiles.com/ugd/b8c837_d5a5e16b484240afa9dc71198d5e6b73.pdf
- https://static.usrfiles.com/ugd/b8c837_6165f694158d43ab92288a43d7f31baf.pdf
- https://static.usrfiles.com/ugd/b8c837_07840ca1bf734c56adf1ec0a5d14d843.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.

Filename	Kind	Source	Size
`font_00_sfnt_off00005d35.bin` `b101d692d410a58519f48c6ba61b825de93c2d7735218199e0f631eccb8a9780`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5D35	5324 bytes
`font_01_sfnt_off00006f62.bin` `fecc8d26b89ab79db15fb98c82ace2aa75409d32640210cb10460a6629700731`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6F62	12340 bytes

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