PDF malware analysis — malicious · a3099a2d2df98be6

MALICIOUS

PDF

57.5 KB Created: 2020-08-29 19:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: f4e14ea68ca82ee8db3b42508814d868 SHA-1: 06a92d0d0a7c5614b0e2ca95039fbfdb30c45c7d SHA-256: a3099a2d2df98be67f0129406f42967f9babb0ca87895ebbd8ffd98b5f3f66b8

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/wix?keyword=iowa+code+232'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The presence of a large number of external links, many pointing to static.usrfiles.com, indicates a link farm strategy, likely to improve SEO for malicious content or to obscure the final destination. The ML classifier also 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=iowa+code+232
- https://static.usrfiles.com/ugd/b8c837_ffaf3c61f6b24b06917941de46807d89.pdf
- https://static.usrfiles.com/ugd/b8c837_c025833d1d234c23969e4c6b46ed53dd.pdf
- https://static.usrfiles.com/ugd/837d34_b3a2246181434046a1412e213fa9eb40.pdf
- https://static.usrfiles.com/ugd/b8c837_dadf793f1f094f208f6c03aaa8983bea.pdf
- https://static.usrfiles.com/ugd/b8c837_2d77f2b57c8a43fd8b1c7c0d218342df.pdf
- https://static.usrfiles.com/ugd/b8c837_5d89034d119d48c48fec966aeb7b236a.pdf
- https://static.usrfiles.com/ugd/b8c837_a35b832cc50148b8aeebe5931d5bafee.pdf
- https://cdn.shopify.com/s/files/1/0429/6251/8182/files/the_slave_girl_buchi_emecheta.pdf
- https://cdn.shopify.com/s/files/1/0436/1384/7710/files/kuvuritunu.pdf
- https://cdn.shopify.com/s/files/1/0459/9401/6935/files/37433207056.pdf
- https://cdn.shopify.com/s/files/1/0433/5370/2550/files/87772286335.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_off0000a705.bin` `d83fd480ac981ea2750ec1032e30af8d6c5fc09c6d200dec629abe15307413bd`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA705	4952 bytes
`font_01_sfnt_off0000b804.bin` `f38f19cdd33c5afd9143d599e623307afc68e2c7d0b608035402b159ae7fc736`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB804	9796 bytes

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