PDF malware analysis — malicious · 73efa2a5ac7440f5

MALICIOUS

PDF

49.0 KB Created: 2020-08-30 03:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 44a3416f1b5a98ae13c3f26639a7f8c6 SHA-1: c1503f646e33d2c1907b20fccb83dfe4b66b2bdc SHA-256: 73efa2a5ac7440f50f0908aff47ca9fdb60a0301d1a71df1babbd577ae090ca5

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, with one pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of malicious links indicates a likely attempt to redirect users to harmful sites.

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.ru/wix?keyword=cooperstown+ohio+baseball
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/48d9a1_c3724dd3b12644bd92cc6ab7ad9961c3.pdf
- https://static.usrfiles.com/ugd/b8c837_b97a0e3b72dc47ab8d3b8cce4610559d.pdf
- https://static.usrfiles.com/ugd/97634b_2f97ad0e090a477d912ffd8d7b0d003f.pdf
- https://static.usrfiles.com/ugd/8de238_4e6453e03f0348d996c2f183297ebed0.pdf
- https://cdn.shopify.com/s/files/1/0434/7104/4770/files/92831793708.pdf
- https://static.usrfiles.com/ugd/b8c837_04575e3c877248a19f699182ba6cc4b2.pdf
- https://static.usrfiles.com/ugd/b8c837_ce165cd67ae64a659f15c55cebf987d1.pdf
- https://static.usrfiles.com/ugd/b8c837_3f66f03741b147d385a27749e24f2d19.pdf
- https://static.usrfiles.com/ugd/7ea8bb_5572c32f812c41e2ab04e0ab568053ff.pdf
- https://cdn.shopify.com/s/files/1/0437/5402/9207/files/64186572862.pdf
- https://cdn.shopify.com/s/files/1/0430/2956/1495/files/54705032907.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/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000081d7.bin` `e5a2a5b5d1d4a726c60399185946de00512258088e294688fda173a0cc006cb0`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x81D7	5044 bytes
`font_01_sfnt_off000092f9.bin` `355e2ceb3a2d81fcfc82783d80164bc44a3476d1074ebb6c88e6277ac2e31619`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x92F9	10580 bytes

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