PDF malware analysis — malicious · 0274423270b3da65

MALICIOUS

PDF

46.5 KB Created: 2020-08-30 01:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 0649a63f48e3d126635ce24ee977cbfb SHA-1: e798c64857845a12830ec6981d78cd462ad1f56e SHA-256: 0274423270b3da65466b4109a5f90fc5009327cdb7225cc7353014e8bcc44046

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, with one identified as a known malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a link farm further supports a malicious intent, likely to lure users to malicious sites for phishing or scams. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

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=immersive+college+of+winterhold
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/b8c837_912569e4c4bb43e8b098a71aeca5d8d9.pdf
- https://static.usrfiles.com/ugd/b8c837_f7a6cfca65204dce83d680068a15a65a.pdf
- https://static.usrfiles.com/ugd/b8c837_7833f64966f34f469fad80d53459a300.pdf
- https://static.usrfiles.com/ugd/accd1f_3298d6efb4db41c594e3ddb298864413.pdf
- https://static.usrfiles.com/ugd/ad2ade_f0590490fdd04d2798a2ea9712bd8f50.pdf
- https://cdn.shopify.com/s/files/1/0428/1312/8863/files/81156368485.pdf
- https://cdn.shopify.com/s/files/1/0432/4196/3679/files/zineravadut.pdf
- https://cdn.shopify.com/s/files/1/0431/8271/9127/files/rawopexar.pdf
- https://cdn.shopify.com/s/files/1/0444/6437/3927/files/project_plan_milestones_and_deliverables_template.pdf
- https://cdn.shopify.com/s/files/1/0437/2388/2650/files/95877145668.pdf
- https://cdn.shopify.com/s/files/1/0434/3093/6733/files/86409625035.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/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000077e7.bin` `02f3773b2b527dde15f617034464a78ff1924ebd29f636db5edd13e2d2739bec`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x77E7	5312 bytes
`font_01_sfnt_off000089de.bin` `67bfd4ca624dc1422a350ce6cdd1b81a724f052e809f74a7273f733f3c9297f3`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x89DE	10540 bytes

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