PDF malware analysis — malicious · 4703d220d22fc9aa

MALICIOUS

PDF

42.1 KB Created: 2020-08-28 22:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 10850971d11cdcb900dd3796b6bb33a5 SHA-1: 540ba44bddbb7eb3e7810ee45a755bff31f35a62 SHA-256: 4703d220d22fc9aa802ba4049cd540b77424072723149844fb4c8e0ed47c740e

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, disguised as a search result for 'Rachmaninoff vocalise imslp cello'. It also features a large number of embedded links to other PDFs, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness, and the PDF structure itself contains suspicious elements like duplicate object bodies.

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/wix?keyword=rachmaninoff+vocalise+imslp+cello
- https://cdn.shopify.com/s/files/1/0431/5011/4965/files/pufulevemimub.pdf
- https://cdn.shopify.com/s/files/1/0434/9090/2166/files/que_es_apgar_familiar.pdf
- https://cdn.shopify.com/s/files/1/0435/6807/0815/files/body_parts_activities_for_kindergarten.pdf
- https://static.usrfiles.com/ugd/b8c837_8c683f470e8d4d2c9afb00afbd6570fe.pdf
- https://static.usrfiles.com/ugd/b8c837_68c449a8f5514fd8bdec4b1be8db192b.pdf
- https://static.usrfiles.com/ugd/b8c837_767516d29e734ebca158c269edd07f9c.pdf
- https://static.usrfiles.com/ugd/b8c837_047b736365034e24a6aa527cd62a058b.pdf
- https://cdn.shopify.com/s/files/1/0432/5307/2022/files/50823163049.pdf
- https://cdn.shopify.com/s/files/1/0433/9322/0758/files/pewixerinubazulo.pdf
- https://static.usrfiles.com/ugd/b8c837_78649abb3d80431f8a9bf0224a081a4f.pdf
- https://static.usrfiles.com/ugd/b8c837_590ecfa9c212456080d2cc9d8e5beffb.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00005a54.bin` `2effee984ba0a6a4503c2555839e2d646d341a0fadebfb6a53f5a3354b060d59`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5A54	4936 bytes
`font_01_sfnt_off00006afc.bin` `3b84347794fde095ecfa2add672ee181c3774ac69cf851281cba486d8233a778`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6AFC	10136 bytes
`font_02_sfnt_off00008dab.bin` `b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8DAB	4324 bytes

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