PDF malware analysis — malicious · db43480787372f17

MALICIOUS

PDF

42.0 KB Created: 2020-08-30 05:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 305c634c6af80381c1ea58389d64188b SHA-1: 7fabd6d3b3bc39ecd422d51c2becee0e525e55f7 SHA-256: db43480787372f17a3c915f9817723f80420fce5be6c6fec652548ce3fbb10b4

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by an ML classifier and contains a large number of external links, many of which point to PDF files hosted on static.usrfiles.com. One of the embedded URLs, https://ttraff.ru/wix?keyword=fun+order+of+operations+worksheets+p, is identified as a known malicious redirector. The document body contains garbled text but includes the same URL, suggesting it's the primary lure.

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=fun+order+of+operations+worksheets+p
- https://static.usrfiles.com/ugd/b8c837_c7112932bd574c32bcf9b88ad9cab949.pdf
- https://static.usrfiles.com/ugd/4e6dd5_3e4be5f809804f6b8665d5ce296245f9.pdf
- https://static.usrfiles.com/ugd/3b47cb_cad43cf67e3e4cbd98c9afa65bc03b4a.pdf
- https://static.usrfiles.com/ugd/b8c837_19154cf37f1f486abfee7d2ebc6f5201.pdf
- https://static.usrfiles.com/ugd/b8c837_9a685069a8e746189e747275ab7cccc3.pdf
- https://static.usrfiles.com/ugd/e1c37d_07e5505a5cb941838c3f86ed8f2cee0a.pdf
- https://cdn.shopify.com/s/files/1/0432/9252/4702/files/85437480646.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51191810805.pdf
- https://cdn.shopify.com/s/files/1/0439/8101/3150/files/gewokimi.pdf
- https://static.usrfiles.com/ugd/c068f8_d2e95c620fe84853abfe39b419223856.pdf
- https://static.usrfiles.com/ugd/4cf28d_d11f9f71841f435e9055fed8661016f5.pdf
- https://static.usrfiles.com/ugd/f96b02_4112d700c6f0450d84ee2c4115290067.pdf
- https://static.usrfiles.com/ugd/b8c837_14104f3d5adf4f858db1a113b1010be9.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_off000065d8.bin` `b46a5c1ffcbfb0d57dc751941ec156bd585253c0ed162772c2ce6eff14afc5c3`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x65D8	5208 bytes
`font_01_sfnt_off000077a3.bin` `90e6ad105d4742c13f60146f0e85b7f4bb658761a29f1f485f243a34912e5cb1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x77A3	10428 bytes

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