PDF malware analysis — malicious · 87a115c4e4bdba63

MALICIOUS

PDF

45.4 KB Created: 2020-09-03 19:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: c3161ef362deac808e6e5d237e8c6065 SHA-1: 6dcc60b3468239a3e4697db135c1d73f390ffaf0 SHA-256: 87a115c4e4bdba630446303762f1dd652f2f9a46c305531dbffa43712a8f880b

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.link/wix?keyword=blank+sheet+music+a4'. Additionally, it features a PDF link farm with numerous links hosted on cdn.shopify.com, suggesting an attempt to obscure the final malicious destination. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the redirector URL, reinforcing the malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 3

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.
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.link/wix?keyword=blank+sheet+music+a4
- https://cdn.shopify.com/s/files/1/0427/7328/2983/files/gajaduvemugupiron.pdf
- https://cdn.shopify.com/s/files/1/0432/9350/7737/files/coffee_grinder_manual_nz.pdf
- https://cdn.shopify.com/s/files/1/0432/1994/3579/files/5747784252.pdf
- https://cdn.shopify.com/s/files/1/0432/5189/2381/files/sample_abstract_chemistry_lab_report.pdf
- https://cdn.shopify.com/s/files/1/0437/2935/4903/files/21482942104.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44994208471.pdf
- https://cdn.shopify.com/s/files/1/0433/3748/2405/files/79528156383.pdf
- https://cdn.shopify.com/s/files/1/0447/3955/9578/files/lokosigakesukes.pdf
- https://cdn.shopify.com/s/files/1/0465/2515/3430/files/70612189497.pdf
- https://cdn.shopify.com/s/files/1/0434/5013/8784/files/html_to_converter_open_source.pdf
- https://static.usrfiles.com/ugd/c0b427_c8229eb8be1e44c6a927f61e9903f725.pdf
- https://static.usrfiles.com/ugd/d7ba0f_848244b19ddd45028ceef97a473ef7e0.pdf
- https://static.usrfiles.com/ugd/b8c837_451a9e4708e1493eac691ea5b6dd5fdf.pdf
- https://static.usrfiles.com/ugd/22bf55_fbe937d1ef5145c39f39f98a26a5447f.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/
- https://cdn.shopify.com/s/

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000062ef.bin` `fb2948cd82ee9e21e92b184d2602bfd31c1d8a5ee934155d56ac5ceecb72d2f4`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x62EF	6648 bytes
`font_01_sfnt_off00007367.bin` `9124b72a92a1d09bb07944cb802339daa2c9fcf54a052063c3fc446b084dd502`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7367	5144 bytes
`font_02_sfnt_off000084ca.bin` `db135abc7a7c1fdee8cb6b1ba790c0a63f016ac92234dd8cd3fcdb3fd9715b38`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x84CA	10352 bytes

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