PDF malware analysis — malicious · 0d9ec4adf821b5a8

MALICIOUS

PDF

40.8 KB Created: 2020-08-20 18:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 834d69b0315eb427cc58c86ad07091fc SHA-1: d136a445cdf424af54a435c116cf7b8d903d95ad SHA-256: 0d9ec4adf821b5a8fded7c663d1de60b2d74798f51c17b36f57c54d941e12a67

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link that redirects to malicious infrastructure, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body also contains a URL that appears to be part of a link farm, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves tricking the user into clicking a malicious link.

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.cc/pify?keyword=avast+antivirus+register+key+free
- http://files.artbytobias.com/uploads/1/3/2/7/132740659/xojerel_turip.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://cdn.shopify.com/s/files/1/0436/5202/2430/files/hosa_medical_math.pdf
- https://cdn.shopify.com/s/files/1/0437/4714/7925/files/donerexiwokob.pdf
- https://cdn.shopify.com/s/files/1/0430/0383/8615/files/jovalibofuxat.pdf
- https://cdn.shopify.com/s/files/1/0438/4037/2896/files/57945015509.pdf
- https://cdn.shopify.com/s/files/1/0433/0445/2246/files/oll_and_pll_algorithms.pdf
- https://cdn.shopify.com/s/files/1/0431/3910/4917/files/venosemanimerobadesowolo.pdf
- https://cdn.shopify.com/s/files/1/0437/4626/3201/files/orthographic_projection_drawing.pdf
- https://cdn.shopify.com/s/files/1/0432/6549/1107/files/tovazilawikolusoso.pdf
- https://cdn.shopify.com/s/files/1/0437/2329/2840/files/49075915418.pdf
- https://cdn.shopify.com/s/files/1/0433/7729/5516/files/year_calendar_template_2013.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_off000062de.bin` `07e0296a388bfd5ea80cbdb64cd0279ccc72afdba45c2e8d0751a1b102916c30`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x62DE	5120 bytes
`font_01_sfnt_off0000746b.bin` `95d6732a3eb5a6d924aebd80a09f109e5a0d84a00787d39de793eab17018c5cd`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x746B	10036 bytes

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