PDF malware analysis — malicious · 8dd73bca11c6bb23

MALICIOUS

PDF

35.5 KB Created: 2020-09-02 07:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 24437a90743b72feebd6b6c962ffb4e0 SHA-1: 5d3f5c6f91f7e15a1b7eb97de128568c20ed06db SHA-256: 8dd73bca11c6bb23baf62ed58c315a0a5c2f1ca37c6f9ec486434ad07b3cf86b

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on static.usrfiles.com, indicating a link farm. One critical heuristic identified a link to a known malicious redirector at https://ttraff.ru/wix?keyword=jealous+guy+piano+sheet. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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=jealous+guy+piano+sheet
- https://static.usrfiles.com/ugd/f34823_f716e70093d84ed79f9f36740482f39d.pdf
- https://static.usrfiles.com/ugd/b8c837_f71b5057ffa44e138626de63a8734e41.pdf
- https://static.usrfiles.com/ugd/b8c837_c8177ee939264312bc87960bd83c0ff5.pdf
- https://cdn.shopify.com/s/files/1/0432/0346/1283/files/19324955597.pdf
- https://cdn.shopify.com/s/files/1/0430/7006/2754/files/rolling_stone_top_500_albums.pdf
- https://static.usrfiles.com/ugd/23e9be_f052aafaac5b4e8991f2ff9376114b76.pdf
- https://static.usrfiles.com/ugd/74a852_6eff0791189e423080ec014d56f6db82.pdf
- https://static.usrfiles.com/ugd/0010c8_8d619817daa4470398f6c7537597d38d.pdf
- https://static.usrfiles.com/ugd/fef806_66ebdedd557f4f15a1b71aa217d2978b.pdf
- https://static.usrfiles.com/ugd/d1d005_557796b5df7642c1ac4c53ae0d242f2f.pdf
- https://cdn.shopify.com/s/files/1/0463/2169/6925/files/57094791027.pdf
- https://cdn.shopify.com/s/files/1/0428/1312/8863/files/49971728182.pdf
- https://cdn.shopify.com/s/files/1/0433/3908/8027/files/3771386135.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_off00004cc9.bin` `a51cd3f9ac23ba5d3cd74301074dedf5da54687ddc5df0471cea9ac45d4d0cc5`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4CC9	5076 bytes
`font_01_sfnt_off00005e15.bin` `90aed86f672fea899f03af13ad799e08876db5ac484dc184dcd3f2532f2bedb9`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5E15	10440 bytes

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