PDF malware analysis — malicious · 5d7366e16357b20d

MALICIOUS

PDF

40.4 KB Created: 2020-08-31 11:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: ee56853e03c9a7efb6e6294d113b2837 SHA-1: 560912a1a7a5d3ac6924ea356a6f03cce5534acf SHA-256: 5d7366e16357b20df5e94c02c42397d4c6d1c545063d6e9e66fcec21dcbb1f06

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to direct users to malicious 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=aptis+reading+part+4
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/b8c837_32bc560b756d44e78d1964fecf29cc72.pdf
- https://static.usrfiles.com/ugd/b8c837_246c0046a4ab40f8b875618f3232a841.pdf
- https://static.usrfiles.com/ugd/fb83f1_4cee8783f003464183b3b9dca4cd655c.pdf
- https://static.usrfiles.com/ugd/77eba6_42c34b970b2049a99c12042c18c32a7b.pdf
- https://static.usrfiles.com/ugd/39d081_bfdbf1e211c2432882b4d3e2ba957f27.pdf
- https://static.usrfiles.com/ugd/83f04e_412edb06f6d44508be521bd76db06d18.pdf
- https://static.usrfiles.com/ugd/9b5f63_a8d54810dfc744b78e584e490439fd94.pdf
- https://static.usrfiles.com/ugd/1fbf8b_14f289d6c6b54a1d8c1b6b1ab1565bef.pdf
- https://static.usrfiles.com/ugd/ae15ca_d25f94bbf2bd45139eda119bbb41ec59.pdf
- https://static.usrfiles.com/ugd/99afdc_893dca4452f5464ba6b563db1dfdc9b6.pdf
- https://static.usrfiles.com/ugd/b8c837_bc15fbd2af7f40538e429bed6b43baaa.pdf
- https://static.usrfiles.com/ugd/405339_aa1030f7280748bdbe7235bcd057123d.pdf
- https://static.usrfiles.com/ugd/a64c8c_d07119c4c87f4d5daf8c58eccbe26362.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_off00006153.bin` `4175511e9e5fbde2dff17817ed1c2e9ec1755772021ab211708e7751bf479fe5`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6153	5172 bytes
`font_01_sfnt_off000072f6.bin` `d1b6b1c9946caacb350e4471cc040257178279f53a89b78ebee481562fc3c71f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x72F6	9896 bytes

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