PDF malware analysis — malicious · a712ce586a1fef59

MALICIOUS

PDF

38.0 KB Created: 2020-08-29 03:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 29ca787bfe036511d21914d2dd4195f9 SHA-1: 9ba9131a3ce4c503a809e51d6494d0ca0911403a SHA-256: a712ce586a1fef59647c48c5d838a09facbe4d8b78d7f110a7a41cbae2bd6037

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to malicious infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.com/wix?keyword=unfinished+tales+illustrated, which is flagged as a malicious redirector. The PDF also exhibits PDF_SEO_LINK_FARM behavior, embedding a large number of external links, many pointing to Shopify domains, likely as a tactic to obscure the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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.com/wix?keyword=unfinished+tales+illustrated
- https://static.usrfiles.com/ugd/b8c837_f83e8e3d58ce4460a856622d799ad8ff.pdf
- https://static.usrfiles.com/ugd/b8c837_66d5e0cfcc704aba89cca66765024ea0.pdf
- https://static.usrfiles.com/ugd/b8c837_472b0cba763d46308803ba4754990508.pdf
- https://cdn.shopify.com/s/files/1/0430/4578/1665/files/sheet_street_kitchen_blinds.pdf
- https://cdn.shopify.com/s/files/1/0429/8804/4442/files/powodenazubasate.pdf
- https://cdn.shopify.com/s/files/1/0434/6881/6544/files/poluzosomaguganipenubokat.pdf
- https://cdn.shopify.com/s/files/1/0433/7424/8097/files/ribipixafofagaroge.pdf
- https://cdn.shopify.com/s/files/1/0428/2561/3475/files/duguzazorowexa.pdf
- https://cdn.shopify.com/s/files/1/0435/4303/6053/files/febufagifibela.pdf
- https://cdn.shopify.com/s/files/1/0433/0107/7142/files/30159592098.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_off00005922.bin` `8cc3f79f3b733a70d6437f7c9133b020dd97900c6120f85e08062f67e5a8ad5a`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5922	4984 bytes
`font_01_sfnt_off00006a07.bin` `dc80a82c7d0b967c3dd49fad310b5ae24927fe0dc6055aabd935da51eaac6791`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6A07	9852 bytes

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