PDF malware analysis — malicious · 3721533cbfe8f111

MALICIOUS

PDF

42.0 KB Created: 2020-09-03 02:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: f98f246de409e8304ccabb1cb1867742 SHA-1: 743369c8bb3807cc2523ac9b76cfd32ec2765a9a SHA-256: 3721533cbfe8f11145bc33a6ac449c27ba28e344bb7d6f20c00d2be241481015

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains the malicious URL and references to other PDFs hosted on static.usrfiles.com, suggesting a link farm designed to distribute malicious content.

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=bonobos+performance+suit+review
- https://static.usrfiles.com/ugd/d43733_af14c70a4cad41009e7cec34a5714403.pdf
- https://static.usrfiles.com/ugd/b8c837_b0b383423ed14af883722d3230e515f7.pdf
- https://static.usrfiles.com/ugd/120874_f686cf80f4874980b511bafe9c802705.pdf
- https://static.usrfiles.com/ugd/d216cb_83b5140f172748fbb049fae4ad001f38.pdf
- https://static.usrfiles.com/ugd/837d34_28c4f7c8402b4805836facc9427f105e.pdf
- https://static.usrfiles.com/ugd/3794ad_e52936be830f416ca224bba2525f2e36.pdf
- https://cdn.shopify.com/s/files/1/0457/0588/7900/files/puwazup.pdf
- https://cdn.shopify.com/s/files/1/0435/4742/6975/files/88506871525.pdf
- https://cdn.shopify.com/s/files/1/0432/7407/6315/files/bienvenue_au_qubec_en_franais.pdf
- https://cdn.shopify.com/s/files/1/0428/1604/5222/files/53455809949.pdf
- https://cdn.shopify.com/s/files/1/0431/9353/2573/files/lawemosemegatatevubixeg.pdf
- https://cdn.shopify.com/s/files/1/0431/1767/4656/files/bluebook_20th_edition_citation_format.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_off000064b9.bin` `e3f995c2769a234e19338a108d0b163a25cdab0cb554a01a78f6a3204d571eb6`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x64B9	5472 bytes
`font_01_sfnt_off0000774c.bin` `c74e0766958f46b6d9091df71078f68e4d0754b29e005fc6898418c2cec46386`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x774C	10792 bytes

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