PDF malware analysis — malicious · 4cc89bc47f13930e

MALICIOUS

PDF

48.5 KB Created: 2020-08-30 00:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 1e8a330fad42d244465fcadba11f3eea SHA-1: 016abd7cd73a2193a2421cd61379d92ca5c9bbf4 SHA-256: 4cc89bc47f13930e1b9f7304c100bcb0bae64091368897ee9d80b7e85589c8ae

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, with one pointing to a known malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body, though partially corrupted, suggests a lure related to 'ML for the working programmer'. The primary attack vector appears to be directing users to malicious infrastructure via embedded links.

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.me/wix?keyword=ml+for+the+working+programmer
- https://static.usrfiles.com/ugd/b8c837_f98fac90fa214322abfe941517a167fb.pdf
- https://static.usrfiles.com/ugd/e73fea_700952d692574af9b01636465ec950c6.pdf
- https://static.usrfiles.com/ugd/b8c837_8cf66af91d7e4cac9d5e03861ab6f5b5.pdf
- https://static.usrfiles.com/ugd/b8c837_61a8fd9d557f4068bb5e783080b20db6.pdf
- https://static.usrfiles.com/ugd/3826db_2dd59fb977744a3385632f8f7ddf94cf.pdf
- https://cdn.shopify.com/s/files/1/0432/7551/8107/files/69893529091.pdf
- https://cdn.shopify.com/s/files/1/0431/5525/9546/files/77253094277.pdf
- https://cdn.shopify.com/s/files/1/0448/3589/7505/files/git_commit_message_template.pdf
- https://cdn.shopify.com/s/files/1/0436/7699/1653/files/29944846948.pdf
- https://static.usrfiles.com/ugd/3f80ec_6e26871990a74b939a0cb65591d65fd8.pdf
- https://static.usrfiles.com/ugd/97aff7_ffaf90c946a94e2f8fed30b29bc99a4b.pdf
- https://static.usrfiles.com/ugd/913720_91436707fd4c407c80ee9507ca663f8b.pdf
- https://static.usrfiles.com/ugd/b8c837_cad9da7fa409402b9399a38ecaa6359b.pdf
- https://static.usrfiles.com/ugd/b8c837_d63e9179ec9c4057915a8716084d9ae0.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_off00007223.bin` `676f03d45da31c3c687fed9a12b670ad6c97779a9104a2933536e9dfe9e658d4`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7223	5300 bytes
`font_01_sfnt_off0000841f.bin` `d1d3db8ffd6e66e7a9446c2bfb0d5d9a0e2e362fb19a82337e696d10a55c12b2`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x841F	15236 bytes

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